What Happens to Your Muscles When You Take Time Off

When working out becomes routine, it's hard to take time off. People have referred to the gym as their sanctuary; the only time they can lock in and get away from the stresses of everyday life.

But certain circumstances may force you out of the gym for a period of time. When that occurs, there is a fear that you may lose everything, particularly muscle size and strength.

Researchers asked a similar question: if you train consistently for months, then take a long break (10 weeks), then start again, do you end up worse off than someone who trained the whole time without stopping? In other words, how much size and strength do you lose in that period of time off?

55 adults were split into two groups: one that trained continuously for 20 weeks, and one that trained for 10 weeks, took 10 weeks off completely, then trained for 10 weeks again. Both groups did the exact same twice-weekly whole-body workouts. Researchers measured leg press and bicep curl strength (1RM), muscle size (ultrasound of thigh and bicep), and jump height throughout.

The time off did cause actual losses. The group lost 5% leg press strength and 4% bicep curl strength. From a muscle size perspective, they lost 10% thigh muscle size and 7% bicep muscle size. On the performance side, jump height decreased 7%.

Here's the good news: they got it back rather quickly. In 5 weeks they were back to their old selves, and by the end of the study there was actually no difference between the groups in any of the measurables. This also suggests that muscle memory is a real phenomenon and that the time off wasn't really detrimental.

Another thing to consider is that 10 weeks off is a long time. If you are a serious lifter, you probably aren't taking that much time off intentionally. It likely would only occur due to a life-changing event or injury.

This study suggests that the losses are real but temporary. Your body is better at "remembering" your hard work than you might think. So the next time circumstances pull you away from training, don't panic about starting from scratch. A few consistent weeks back in the gym, and you'll likely be right back where you left off.

Copyright 2026 The Arena Group, Inc. All Rights Reserved

This story was originally published June 27, 2026 at 2:46 PM.