Pull Ups
Grip the bar with hands shoulder-width apart using an overhand grip (palms facing away from you). You can also use a neutral grip with palms facing each other.
Engage your core by tightening your abdominal muscles. This helps stabilize your body.
Retract your shoulder blades to keep your back straight and engage your lats. Avoid arching your back.
Bend elbows and pull yourself up until your chin clears the bar. Focus on using your back and arm muscles rather than momentum from your legs.
Pause at the top contracted position for a second before slowly lowering yourself back down in a controlled manner.
Breathe out as you pull yourself up, breathe in as you lower down. Don't hold your breath.
Keep your body straight and avoid swinging or kipping motions with your legs to get momentum. This cheats the exercise.
Start with however many reps you can complete with proper form. Try to increase reps over time.
If you can't complete a full rep, use an assisted pull-up machine or resistance bands looped on the bar to help out until you build strength.
For added difficulty: do pull-ups with palms facing each other, use a wide overhand grip, or hold at the top contracted position for longer.