The traditional bicep curl is probably one of the best exercises there are to target the front of your upper arms. If you have heavier dumbbells, use just one by holding the heads in each hand and curling up. If you have lighter dumbbells, you can take one in each hand. You could even refill an empty milk bottle with rice or flour until it is at your desired weight and hold the handles as you curl.

Hold the dumbbells in your hands with your palms facing forwards and the back of your hands resting on your thighs.
Bend your elbow to curl your arm up. As you do this, keep your elbows and upper arms tucked into the side of your body and don’t let your wrists tip forwards or backwards.
When your fist meets your shoulder, squeeze for a second then begin to slowly lower down to the starting point.

Strength training: 4 of the best bicep and tricep exercises to do from home