1RM, or at most one Rep,

Is the abbreviation of the maximum value of a repetition,

Represents the maximum strength that a muscle can produce when it contracts,

For example, if a person can press 50 kilograms eight times,

But the bench press of 62 kg can only be 1.

That 62kg is his bench press 1RM.

But because different movements use different muscle groups,

So there will be different values of 1RM.

17.7rm means only 17.7kg 1.