In trained men performing high-load lower-body resistance training, training to failure results in 13.6% more repetitions and 11.5% greater volume load compared to stopping 1–2 repetitions short of failure, yet both approaches produce equivalent muscle hypertrophy and strength gains, suggesting that training close to failure achieves similar outcomes with higher training efficiency per unit of volume.

When lifting heavy weights close to failure, fatigue builds up in the muscles, which signals the nervous system to recruit all available muscle fibers. This full recruitment generates enough force and tension to trigger muscle growth and strength gains, even if the set ends before complete exhaustion. The muscles adapt by adding more contractile units and rearranging their structure to produce more force, making training just as effective without pushing to total failure.