One great way to stimulate growth in your biceps is performing “21’s”.
21’s- The number stands for the total amount of repetitions performed per set. When performing basically any curling motion (I prefer the preacher curl, pictured*) you will separate segments of the range of motion (bottom, top, and full range of motion).
How to do it:
For each range of motion you will perform 7 repetitions for a total of 21. With weight in hand and in the curling position only move the weight through the first half of the motion (curl half way up) for 7 reps.
Then, curl the weight for 7 reps from the top only going down half way.
After the 7th rep perform 7 more full repetitions (the full range of motion).
7 reps- bottom half of the curl
7 reps- top half of the curl
7 reps- full range of motion