Lifting in Converse: The biomechanics, benefits, and risks of flat sole training

Converse-style zero-drop, incompressible flat soles can improve center-of-pressure stability and reduce energy loss from sole compression in deadlifts, but for squats they remove the 0.75 to 1 inch heel lift that helps ankle dorsiflexion. If mobility is restricted, that can increase knee and lumbar torque. Here is how to know when flat shoes are the right tool for your mechanics, and when a heeled lifter (or targeted mobility work) is the safer upgrade.

Key takeaways

• Converse-style zero-drop, incompressible flat soles are a strong choice for deadlifts because they can improve perceived stability and tend to reduce energy loss from sole compression compared with highly cushioned shoes.
• For squats, flat shoes remove the typical 0.75 to 1 inch heel lift of weightlifting shoes that helps ankle dorsiflexion, and restricted mobility can shift torque to the knees and lumbar spine via excessive forward lean or back rounding.
• Use the Weight-Bearing Lunge Test (WBLT) as a quick screen before squatting heavy in flats. Place the toes about 5 inches (approximately 12 cm) from a wall and, if the knee cannot touch without the heel lifting, limited dorsiflexion may be contributing; compare both sides and assess your actual squat pattern under light load, and consider a heeled lifter while you address mobility.
• Abruptly switching from common daily footwear with a 10 to 12 mm heel drop to zero-drop flats under load can increase tension on the Achilles tendon and plantar fascia, raising risk for Achilles tendinopathy, arch strain, and plantar fasciitis.
• Match footwear to the lift by using Converse for deadlifts and (if dorsiflexion is limited) heeled shoes for high-bar/front squats, and build intrinsic foot strength with short foot drills while ramping volume gradually in flats.

The relationship

Flat, incompressible shoes like Converse can increase perceived stability and reduce sole compression during heavy lifts compared with cushioned running shoes. Powerlifters have long favored flat shoes for this reason, because thick, cushioned running soles can make a heavy lift feel less stable.

The appeal of Converse All Stars (Chuck Taylors) lies in their construction: a flat, relatively stiff rubber sole with zero heel-to-toe drop. This places them close to “minimalist footwear” in the context of resistance training. Running shoes are engineered to absorb impact through EVA foam or gel, while lifting generally favors a sole that resists compression. How much shoe construction changes performance under the bar is still an open research question, and the studies cited in this article compared weightlifting shoes with running or athletic shoes rather than testing Converse directly.

The flat sole suits the posterior chain mechanics of a deadlift, but it can expose deficits in ankle mobility during squats. A standard Olympic lifting shoe has a hard heel raised by 0.75 to 1 inch. This elevation lets the knee travel forward without requiring as much ankle dorsiflexion from the lifter. A 2016 biomechanical analysis in the Journal of Strength and Conditioning Research by Whitting and colleagues, in nine men squatting at 50, 70 and 90% of their one repetition maximum, found that peak ankle dorsiflexion was significantly greater in running shoes than in weightlifting shoes; the authors concluded that claims about the benefits of weightlifting shoes for the squat need further investigation.^[1] Without a heel lift, the athlete needs enough ankle range of motion of his own to reach depth with good positions.

How it works

Center of pressure and stability

Stability in lifting is the ability to keep the body’s center of mass over its base of support. Converse shoes have a thin, dense rubber outsole that limits the small shifts that come with soft foam compression. Keeping the foot closer to the ground (a low “stack height”) shortens the distance between the ankle joint and the floor, which may lower the balance demands on the lower-leg stabilizers and let the quadriceps, glutes and hamstrings express force more consistently. This is mechanical reasoning; none of the studies cited here measured balance or center of pressure in flat shoes.

Force transfer

In a deadlift or squat, the lifter drives force into the floor and the floor pushes back with an equal force that moves the weight. A cushioned midsole compresses when that force is applied, so part of the effort goes into deforming the shoe rather than into a stable base. The hard rubber of a Chuck Taylor does not eliminate all losses, but it tends to reduce energy loss from sole compression compared with highly cushioned shoes.

Kinematics and ankle dorsiflexion

Kinematics refers to the geometry of motion. The “drop” of a shoe can alter lifting kinematics, and a raised heel increases usable ankle dorsiflexion.

Dorsiflexion: The action of bending the foot upward toward the shin.

In a 2012 study in the Journal of Strength and Conditioning Research, Sato and colleagues filmed 25 college-aged lifters squatting 60% of their one repetition maximum and found that weightlifting shoes increased foot segment angle by 3.5° and reduced trunk lean by 22 mm compared with running shoes, while peak thigh flexion did not differ.^[2] According to a 2017 study in the Journal of Sports Sciences, Legg and colleagues used 3D motion capture and a force platform in 32 lifters and found that weightlifting shoes reduced ankle flexion and increased knee flexion compared with athletic shoes, with a more upright trunk and a greater knee moment in unloaded squats; experienced squatters gained more knee and hip flexion from the shoes than novices did.^[3]

For many deep squats, especially more upright high bar or front squat patterns, the knees need to travel forward substantially, often past the toes. If a lifter wears Converse (0 mm drop) and lacks the ankle range to match, the body compensates. Common compensations include the hips shooting backward or the lower back rounding (flexion) to keep the center of gravity over the feet. This can shift demand away from the quadriceps and toward the lumbar spine, potentially increasing shear stress on spinal tissues.

Conditions linked to it

Lifting in Converse is generally safe for deadlifts, but using them for squats or Olympic movements without the needed mobility can aggravate specific musculoskeletal conditions.

Plantar fasciitis and arch strain: Converse offer minimal arch support. Under heavy loads, such as a one repetition maximum squat, the arch may collapse inward (pronation), and repeated collapse under load can strain the plantar fascia, the thick band of tissue connecting the heel to the toes. That risk is inferred from how the tissue is loaded; it has not been measured in studies of flat lifting shoes. The plantar fascia does respond to progressive loading: in a 2015 randomized controlled trial in the Scandinavian Journal of Medicine & Science in Sports, Rathleff and colleagues assigned 48 patients with ultrasound-confirmed plantar fasciitis to shoe inserts plus either daily stretching or high-load heel raises every second day, and the strength group reported a Foot Function Index 29 points lower at 3 months, with no difference between groups at 1, 6 and 12 months.^[4]

Achilles tendinopathy: For lifters used to shoes with a 10 to 12 mm heel drop in daily life, switching abruptly to a zero-drop shoe for loaded exercises can increase tension on the Achilles tendon. The tendon has to lengthen further in the flatter position, which can contribute to irritation if the tissue has not adapted.

Lumbar strain (lower back pain): Restricted ankle mobility in flat shoes often leads to a “good morning” squat pattern, where the chest drops and the hips rise too fast. The longer lever arm can increase torque demands on the lumbar extensors and passive spinal tissues. Persistent arch or lower back pain after squatting in flats suggests that you need more support, more mobility work, or both.

Symptoms and signals

Whether lifting in Converse suits you shows up in how your body responds during compound lifts. The signals below suggest a flat shoe may be contributing to a breakdown in mechanics.

Interpret the pattern, not just one cue. Heel lift and excessive forward lean often point to an ankle mobility limitation (or a stance that demands more dorsiflexion than you have), while knee valgus can be a technique and strength issue that starts at the foot or hip, not only the shoe. If pain is sharp, progressive, or changes your movement on the fly, deload and get a form check from a qualified coach. If symptoms persist for more than one to two weeks, involve a clinician (such as a physical therapist) to rule out tendon or joint injury.

• Heel lift: Your heels rise off the floor at the bottom of a squat. This usually means you have reached the end of your available ankle dorsiflexion.
• Knee valgus (caving in): Your knees collapse inward as you push up from the bottom of a lift. Hip and glute weakness is a common cause, but it can also start at the foot: with little arch support, the foot can roll in and pull the knee with it.
• Excessive forward lean: You struggle to keep your torso upright during a back squat and fold at the hips.
• Medial foot pain: Sharp or aching pain along the inside arch of the foot after a heavy session.

What to do about it

Whether you are starting to lift in Converse or already have problems in them, work through these steps in order.

1. The Weight-Bearing Lunge Test (WBLT): Before squatting heavy in flats, use this as a quick screening tool for ankle mobility. Place your foot 5 inches (approximately 12 cm) away from a wall. Keep your heel on the floor and try to touch your knee to the wall. Compare both sides and assess your actual squat pattern under light load.
   
   Pass: Knee touches the wall without heel lift. Dorsiflexion may be adequate for many flat-shoe squats, though your stance and squat style still matter.
   
   Fail: If your heel lifts or your knee cannot reach at about 5 inches, limited dorsiflexion may be contributing, and heeled lifting shoes (squat shoes) may help while you work on mobility.
2. Match the shoe to the lift: You do not need to wear the same shoe for every exercise.
   
   Deadlifts: Converse work well here for many lifters. The flat sole slightly shortens the pull and can help you feel stable through the midfoot. Keep the bar over midfoot and do not let your hips shoot up early.
   
   Low bar squats: Converse may work if you have passed the WBLT, as this style typically requires less forward knee travel.
   
   High bar and front squats: These usually require more ankle dorsiflexion. Heeled weightlifting shoes help many lifters keep a more upright torso here.
3. Build “foot core” strength: Because Converse lack arch support, your intrinsic foot muscles do more of the work. Add short foot drills: pull the ball of your foot toward your heel without curling your toes. Start with lower training volumes in Converse so your Achilles tendons and plantar fascia can adapt to the zero-drop position.

Fatigue, falling strength or low sex drive that persist despite consistent training are not a footwear problem and can have a hormonal cause. Veedma offers testing that includes total and free testosterone measured by LC-MS/MS with LH and FSH, or a review of labs you already have, with licensed providers who can prescribe enclomiphene or an enclomiphene plus tadalafil tablet when appropriate. Enclomiphene is not an FDA-approved drug; it is prescribed after a provider confirms the diagnosis and is compounded by a licensed U.S. pharmacy.

Myth vs fact

Myth: You need cushioned shoes to protect your joints while lifting heavy.

Fact: Cushioning can create instability. Stability protects joints in static heavy lifting, while cushioning is primarily for impact protection (like jumping or running).

Myth: Converse are the best shoes for all powerlifting movements.

Fact: They are arguably the best budget option for deadlifting. However, for squatting, specialized weightlifting shoes (lifters) are mechanically superior for athletes with average or poor ankle mobility.

Myth: Wearing flat shoes will eventually flatten your arches.

Fact: If you progressively overload correctly, training in flat shoes can strengthen the muscles that support your arch, acting as a workout for your feet.

Bottom line

Converse are appropriate for deadlifts (and some low bar squats) when you want a low, stable base and your mechanics stay clean. Heeled lifters are usually better for high bar and front squats if ankle dorsiflexion is limited or you cannot reach depth without heel lift or excessive forward lean. If switching to flats triggers persistent foot, Achilles, knee, or back pain, reduce load and volume and get coaching or clinical evaluation.

References

1. Whitting JW, Meir RA, Crowley-McHattan ZJ, et al. Influence of Footwear Type on Barbell Back Squat Using 50, 70, and 90% of One Repetition Maximum: A Biomechanical Analysis. J Strength Cond Res. 2016;30:1085-92. PMID: 26349043
2. Sato K, Fortenbaugh D, Hydock DS. Kinematic changes using weightlifting shoes on barbell back squat. J Strength Cond Res. 2012;26:28-33. PMID: 22201687
3. Legg HS, Glaister M, Cleather DJ, et al. The effect of weightlifting shoes on the kinetics and kinematics of the back squat. J Sports Sci. 2017;35:508-515. PMID: 27096286
4. Rathleff MS, Mølgaard CM, Fredberg U, et al. High-load strength training improves outcome in patients with plantar fasciitis: A randomized controlled trial with 12-month follow-up. Scand J Med Sci Sports. 2015;25:e292-300. PMID: 25145882