You probably have to manipulate the training variables. It normally takes about a month in a half for your body to scientifically adapt. So if your lifting heavy from a strength 4-6 rep range, you will need to lift from a hypertrophy rep range 10-12 or an endurance rep range 15-25. You have to mix it up. Same goes with the others so if your lifting from a hypertrophy rep range, lift in a heavier rep range etc.
At the same time, bigger muscles need more weights to stimulate growth. For example your legs need more weight than your biceps which is why bigger muscles take longer to recover. So your biceps don't need to much weight but just focus on changing your rep ranges. If you've been doing that you may need to prioritize the sequence which means change the order or excercises of the workout.
The last thing if you've already manipulated those two variables which were rep range, and sequence, you can look into manipulating the intensity or tempo of the exercise. You can also make sure your negatives in your reps are slower than the positives. I once heard a saying "Control is the currency for growth."
There are hundreds of other things you can manipulate such as rest time or going to failure, or supersets and dropsets but those are just a few ideas.
Hope this helps.
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