RM is the abbreviation of "repetition maximum" in English, which is translated into "maximum repetition value" in Chinese, and it is translated into "maximum repetition number", "weight of maximum repetition number" or "maximum weight of a certain repetition number". In bodybuilding, "RM" is conventionally defined as a load weight that can be repeated a certain number of times. For example, "6 ~ 12RM" means "the weight that can be tried repeatedly or continuously at most 6 ~ 12 times".

Generally, 6- 12RM and 1-5RM are used by senior bodybuilders to impact their weight.

(1) Weight: low frequency (1-5 times), high number of groups (5- 10 groups) and long gap (2-3 minutes). Mainly used to improve absolute power.

(2) Medium weight: medium times (6- 12 times), medium number of groups (4-6 groups) and medium gap (1-2 minutes). Mainly used to increase muscle circumference.

(3) Medium weight: medium and high frequency (12-20 times), medium and high number of groups (more than 5 groups), short gap (30 seconds-1 minute). Mainly used to highlight muscle lines.

(4) Light weight or no load: VHF (more than 25 times), medium-high group number (more than 4 groups), medium-short gap (about 1 min). Mainly used to lose weight, enhance muscle endurance and enhance cardiovascular function.