It's a gym machine where the barbell is fixed on two vertical rails. It only moves straight up and down, and it has hooks to lock it if you get stuck.
*Pros:*
- Safer to train alone - you can lock it anytime
- Good for beginners to learn form
- Helps you focus on the muscle
-Best exercises:*
- Squats
- Bench press
- Shoulder press
- Lunge
