6. Seated military press
You never push overhead in a perfectly straight line—the movement drifts forward and backward, your arms twist, and your body shifts. Machines, however, eliminate that freedom.
And although the seated military press can add muscle to your shoulders, it also spawns shoulder problems because it strains your joints as you reach overhead. If both handles are connected, you can even create imbalances where one arm works harder than the other.
Use these instead:
Dumbbell Overhead Press
Pike Pushup (shown in the picture above)