"RM" in fitness courses is the abbreviation of "relative weight". Refers to the maximum weight that you can finish a certain number of times in a row (such as15,25, etc.). ). For example, 15RM means that you can complete the maximum weight of 15 times, or you can complete the maximum weight of 15 times continuously. Similarly, 25RM means that you can finish the weight up to 25 times in a row, or you can finish the maximum weight 25 times in a row.

The weights of different RM are mainly used to achieve different training objectives. For example, training above 25RM is mainly used to improve muscle mass, reduce fat, enhance cardiopulmonary function, and keep fit and shape. 15RM to 20RM training, mainly to exercise muscle lines and improve muscle elasticity and endurance. 6RM to 12RM training is mainly used to increase muscle circumference, which can also be said to increase muscle mass.

Please note that this is not a hard and fast rule. Different training objectives and individual differences may require different training intensity and time.