After practicing fitness for a year, I relaxed from last month. My arms grew 2 and my legs grew 3 cm. I often study this knowledge, and my opinion should be good:

Can't jump? No, a group of studies is: first practice strength in one day, then practice endurance in the same part, and the growth of girth is only a little less than that of the control group. Practice strength on the first day, and practice the endurance of the same part on the second day, and the girth is not affected. This answer is very detailed.