Execution:
1
Seated, spread your legs wide and hold a dumbbell with a neutral grip.
2
Brace your elbow against the inside of the thigh on the same side.
3
Curl the dumbbell up to your shoulder, squeezing the biceps at the top.
4
Lower slowly to full extension.
Tip: keep the elbow fixed against the thigh — this guarantees full biceps isolation.