Can I do all my exercises with just dumbbells?

Dumbbells alone can target every major muscle group. Chest press, rows, shoulder press, curls, tricep extensions, lunges, goblet squats, Romanian deadlifts, and lateral raises cover a comprehensive full body routine. The main limitation is that heavy lower body exercises (squats, deadlifts) eventually require more weight than most adjustable dumbbells provide. Adding a pull up bar and resistance bands rounds out a complete home gym.