Doing one hour of static stretching every day for six weeks might make your calf muscles significantly stronger. In fact, the strength gains could be similar to those from traditional muscle-building workouts that only take 15 minutes three times a week.

Doing one hour of static stretching every day for six weeks might make your calf muscles just as strong as doing traditional weightlifting three times a week. This suggests that long stretching sessions could be a surprisingly effective way to build strength, not just improve flexibility.

Doing static stretching for five weeks, twice a week for half an hour, can slightly but noticeably make your calf and ankle muscles stronger. This happens because stretching helps your nerves and muscles work together better, rather than actually making the muscle tissue itself bigger.

Doing a lot of long static stretches can actually build up and strengthen your calf muscles just as much as traditional weightlifting. It means stretching isn't just for flexibility—it can also help you get stronger and bigger muscles.

Doing static stretches, whether hard or easy, won't make your calf muscles stronger or more powerful over a month. Your strength and jumping ability stay exactly the same because stretching doesn't actually force your muscles to work hard enough to build strength.

Adding long static stretches to your regular weightlifting routine might help competitive bodybuilders build stronger calf muscles. Over three months, this extra stretching could boost their leg strength by about 11%, making it a useful addition to their normal workout plan.