Leg Press Machine

The leg press has you push a weighted platform away (or your seat away from a platform) along a guided track, driving through the legs. Common types are the 45° plate-loaded sled press, the horizontal/seated selectorized leg press, and the vertical leg press.

Pros

• Heavy lower-body loading without axial spinal load — the back is supported, so it spares the spine relative to a barbell back-squat; useful for those protecting the low back or training the legs to failure safely (no spotter needed).
• Targets quads, glutes, hamstrings (quadriceps) with adjustable foot placement (high/wide shifts emphasis to glutes/hams; low/narrow to quads).
• Easy to learn; good for high-volume hypertrophy.

Cons

• Fixed path, seated/supine position — far less stabilizer, balance, and core demand than a squat; limited carryover to standing athletic strength.
• Lumbar rounding risk if you press the knees too deep toward the chest and the pelvis tucks ("butt wink") under load — keep ROM within control (see knee-squat-safety).
• Ego-loading risk — people pile on weight with partial ROM; quantity of plates ≠ leg strength.

• Guided leg push (45° sled, horizontal, or vertical); back supported, no axial spine load.
• Trains quads/glutes/hams; foot placement shifts emphasis.
• Spares the spine and needs no spotter; good for safe high-volume work.
• Cons: low stabilizer/balance demand, lumbar-tuck risk at deep ROM, ego-loading.

• plate-loaded-machine / selectorized-machine — its machine categories.
• back-squat — the free-weight movement it substitutes for.
• knee-squat-safety — depth/knee considerations.
• quadriceps — primary muscle trained.