Standing military (overhead) presses
Take an exercise machine and there’s a free-weight/GBCM exercise equivalent that is superior.
In effect, balance and stability gets worse from using machines. The older we get, the more our nervous system deteriorates thanks to the inevitable aging process, the more we need to stay away from machines and “get into” GBCMs. Trainers defend their use of machines along the lines of, “Mrs. Jones’ balance is so bad/back is so weak/range of motion is so diminished that she needs to work in a machine so she can regain some function.” Incorrect!
Machines avoid strengthening the weaknesses by taking them out of the equation. The person with bad balance who uses a hamstring curl machine instead of modified split squats or lunges, uses the leg press instead of body weight squats or military press machine instead of performing the lift standing with dumbbells, is not addressing their needs.
Athletes who use machines can’t improve performance and are training in a manner that impedes progress. Athletes never compete in a seated position (except for rowers!) and work in all planes of movement; machines cannot provide the proper training environment for athletes or weekend warriors.
Your personal trainer doesn’t know what they’re doing if they have you using exercise machines.