Training for muscular endurance involves performing sets with more than 15 repetitions, whereas training for hypertrophy typically involves fewer than 15 repetitions.

“we used to think and they used to teach all the personal trainers this there was a strength endurance continuum such that you're doing one to five reps and you're building strength and then you're doing something kind of moderate range up to 12 and that's hypertrophy and then beyond that 12 to 20 that's in muscular endurance”