JumpSport 370 Home Gym 39" Heavy Duty Fitness Trampoline with 4-In-1 DVD, BlackFor big movements and compact storage. The JumpSport 370 Fitness Trampoline gives you the freedom to move, delivers efficient cardio workouts, and boosts your fitness level and energy. JumpSport Fitness Trampolines deliver the smoothest, deepest, and most supportive low impact bounce. The 370 has a 35. 5 inch jumping surface, arched legs, and 7 easy to adjust firmness settings. The JumpSport hinge is light but creates a super stable, rigid frame rail