As you begin to increase your exercise library from a handful to literally hundreds of exercises and variations, where everyone can be good at a certain extent, would be a serious mistake to think not return to those basic movements with which you started. That's because the best exercises to increase muscle mass are in these basic moves you learned in your first year as eg bench press , squats , deadlifts , rowing , etc. They should be the basis of all routine. Start your workouts with them adding a good .