Just Three Workouts a Week Can Significantly Boost Muscle Strength, Study Finds

New research indicates that exercising just three days a week can lead to measurable gains in muscle strength, even with brief, focused movements, offering a more accessible path to fitness for many.

A 2023 study from Edith Cowan University (ECU) published in the European Journal of Applied Physiology investigated the optimal frequency of exercise for building strength. Researchers had previously found that a single three-second maximum-effort eccentric bicep contraction – slowly lowering a weight – performed daily improved muscle strength. This new study compared groups performing the contraction two versus three days per week, revealing that the three-day group experienced significant increases in both concentric (2.5 percent) and eccentric (3.9 percent) strength after four weeks, while the two-day group showed no significant change.

“Our previous work has shown regular, shorter exercise is more beneficial than a one or two big training sessions in a week,” explained Professor Ken Nosaka, lead author of the study. “Now, we have a clearer idea of where the tipping point is where you start to see meaningful benefits from such a minimal exercise. These new results suggest at least three days a week are required, at least for the single three-second eccentric contraction training.” While five days a week yielded a 10% improvement, Professor Nosaka emphasized the importance of rest for muscle adaptation, noting that the rest periods between contractions in the study were vastly longer than the exercise itself. Understanding optimal recovery is crucial for maximizing fitness gains; learn more about muscle recovery strategies.

Beyond strength gains, exercise is widely recognized for its positive impact on both physical and mental wellbeing. The World Health Organization recommends at least 150 minutes of moderate-intensity activity per week, alongside muscle-strengthening exercises. Recent research from The University of Texas at Arlington also found that swapping just 30 minutes of sitting for light activity can improve mood the following day, highlighting the benefits of even small increases in movement. This research underscores the importance of incorporating regular physical activity into daily routines to combat sedentary lifestyles and improve overall health.

Researchers plan to continue investigating the optimal frequency and duration of exercise for various types of activity, and emphasize that even small amounts of regular movement can make a significant difference to health and fitness.