Complex sentence: Though 1RM is the most popular and commonly used, any number of reps can be used, for instance a 10RM or 15RM, in fact your 10RM weight will be much more useful for you in terms of training than your 1RM.
Split into simpler sentences: Though 1RM is the most popular and commonly used, any number of reps can be used, for instance a 10RM or 15RM. In fact your 10RM weight will be much more useful in terms of training than your 1RM.