The pushup tones your pectorals, deltoids, and triceps from shoulder to elbow. If full pushups are too hard, do them from your knees. Leaning against a wall or chair helps.
Defining and toning your biceps is easy with bicep curls. Slow repetitions maximize tension and results.
The tricep dip, another two-for-one bodyweight exercise, targets the triceps, chest, and shoulders for entire upper-body definition.
Targeting multiple muscles in your biceps is important. The hammer curl works the brachioradialis and biceps, giving you well-rounded arms.
If you want to define your arms, hammer your triceps with various exercises. Most gyms feature cable devices, so the triceps cable rope extension is a good alternative.