Leg press and hack-squat machines work the major leg muscles—primarily the quadriceps, hamstrings, glutes, and calves.
Press-style home gym equipment commonly uses three resistance systems: plate-loaded setups (Olympic-style plates and band pegs), cable-and-pulley systems with PU-coated cables and dual pulleys, and adjustable weight stacks.
Leg press machines often include adjustable lockout positions and multi-level safety limiters. Smith machines and power cages typically include bar catches or safety catches to secure the bar at multiple heights.
Both loading methods are used. Some machines are plate-loaded (compatible with 2" Olympic plates and band pegs), while others use adjustable multi-piece weight stacks (examples include a 10-piece, 150 lb stack).
Reported load capacities vary widely across models—from about 150 pounds up to 2,200 pounds. Example listed values include 150, 300, 600, 660, 900, 1,500, 1,800 and 2,200 pounds, so check each model’s specific rating.