New Study Settles Sumo Deadlift 'Cheating' Debate Once and For All

Quick Facts

Sumo deadlifts move 20-25% shorter distance but require different muscle activation patterns than conventional deadlifts
Both styles are legal in powerlifting competitions with roughly 50/50 split among elite lifters
New 2025 study shows each style targets different muscle groups and serves distinct training purposes

A comprehensive 2025 study published in Frontiers in Bioengineering and Biotechnology has settled the long-running debate about whether sumo deadlifts are “cheating.” The research examined 30 experienced male lifters performing both conventional and sumo deadlifts at 85% of their one-rep max.

The study found that sumo deadlifts do move a distance approximately 20-25% shorter than conventional deadlifts. However, the shorter range of motion comes with trade-offs that make it far from “easier.”

“Conventional and sumo deadlifts are not interchangeable exercises,” researchers concluded. “They impose distinct biomechanical demands that influence which muscles are emphasised and how joints are loaded.”

Different Muscles, Different Challenges

The research revealed significant differences in muscle activation. Conventional deadlifts primarily target the posterior chain through greater hip extension demands and higher activation of the biceps femoris and thoracic erector spinae.

Sumo deadlifts emphasize anterior chain involvement with greater vastus lateralis activation. They also produce substantially higher joint moments in the frontal and transverse planes at both hip and knee, reflecting increased mediolateral stabilization requirements.

A 2002 electromyographic analysis found that conventional deadlifts create more shear force on the back, specifically at the L4 and L5 vertebrae. The researchers also documented greater back extensor, hamstring, and gastrocnemius requirements for conventional pulls.

Competition Reality

Elite powerlifting data contradicts the “easier” narrative. In major organizations like the International Powerlifting Federation, the split between stances is close to 50/50 among competitors.

“If sumo was the easier lift, wouldn’t everyone be doing it?” noted one powerlifting expert. “Why would so many lifters be able to pull more conventional? It doesn’t make sense.”

Both styles are legal in all major powerlifting federations. Recent achievements include Colton Engelbrecht’s 520-kilogram sumo deadlift with lifting straps and Kjell Bakkelund’s 317.5-kilogram world record in the 66-kilogram weight class.

Body Type Matters

The research suggests that individuals with longer relative torsos may gain an advantage by adopting the sumo stance. These findings have important implications for strength coaches determining which style suits new deadlifters.

“It might be appropriate for powerlifting coaches to measure sitting height and torso length prior to prescribing a specific deadlift style,” researchers recommended.

Powerlifting coach Eugen Loki explained the practical differences: “Sumo deadlifts are typically more difficult off the ground but easier at lockout, while conventional deadlifts are the opposite.”

Training Applications

The distinct biomechanical profiles make each style valuable for different training goals. Sumo deadlifts may be particularly beneficial for knee reinforcement and situations requiring enhanced mediolateral stability.

For rehabilitation contexts, the sumo stance’s emphasis on frontal plane demands supports its relevance in programs requiring improved lateral stability.

The vertical bar distance, mechanical work, and predicted energy expenditure were approximately 25-40% greater in the conventional group, but this doesn’t translate to one being superior to the other.

The scientific consensus is clear: neither style is cheating. They are biomechanically different exercises that serve distinct purposes and suit different body types and training goals.