I’m a 15 and a half year old beginner and I’ve been lifting for about 2 months. I’m 5’8 and i weigh 143 pounds.
I’m currently doing a fullbody split 3x a week.
I’m staying in the 8-12 rep range.
How often should I be able to increase the weight on my lifts?
How much stronger should I be getting after each workout?
Should I be able to do heavier weights every week?[/quote]
You don’t necessarily have to use heavier weights every week but you should be progressing at least in reps.
When you get to the higher end of the 8-12 rep range you’re currently working in add say, 5lbs and work your way back up to 12.
There’s no way to know how much stronger you should getting from workout to workout but ideally, since you’re young, you should progress pretty fast.