Trainers say a handful of simple exercises—like presses, curls, and push-up variations—effectively build upper-arm strength.

Cable face-pull with external rotation: Start sitting at a cable station holding a rope attachment with palms facing in. Your arms should be straight to start. Pull the rope toward your face, bending ...

Strengthening your shoulder muscles with exercises like bent-over row and mountain climbers can help you gain definition and maintain mobility.