Try that test I suggested. If you can do a bicep curl with that weight for more than 10 reps, then that weight is too light. Continue to add weight until you can do the bicep curl up to about 10 reps. This recommendation is for developing muscles. Like I say, if you want to increase your stamina/endurance, different weight and reps considerations are required.
The set number of reps test applies to squat, etc etc.
I am just passing on to you what I read some time ago.
Important to know the distinction between exercise to develop muscles and exercise to develop endurance. They are different types of exercise with different objectives.
