If you were strong once, your body kept the receipt. In one study of older men112, the men trained for 12 weeks, stopped for about as long, then started again. The first time, building their strength took 12 weeks. The second time, they were back to their peak in under 8. A second study used healthy young men, so treat this as a clue, not a promise. Their muscle grew with training, shrank when training stopped, and grew the most when they started again. The genes that drive growth stayed switched on the whole time the muscle was gone. Stopping has a price. In a small study of older men, the men who quit lost about 11 percent of their strength in six months. The men who kept one session a week held on to all of it. These were small studies of healthy volunteers. None tested men recovering from surgery. But they point the same way. If you were strong before your injury or surgery, you are not starting from zero. For a man over 40 in injury recovery, strength training is how you get that strength back, and one session a week is how you keep it. That is how you build muscle after 40. When were you last strong? What could you do then that you want back? Source: Blocquiaux et al., Experimental Gerontology; Seaborne et al., Scientific Reports 2018; Taaffe et al., J Gerontol A 2002. Recapture Strength!