If you want big biceps and arms, do curls. Follow this step-by-step guide to doing Bicep Dumbbell Curls, without making any mistakes in your posture or form.

1.    Stand straight  with dumbbells in each hand
2.    Maintain one arm distance between both hands
3.    Keep upper arm stationary
4.    Exhale and curl weights while contracting your biceps
5.    Inhale and bring your hands back to the starting position.

This completes one rep.

Do 3 sets of 10-12 reps each for best results.