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?