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Mini trampolines initially gained popularity back in the 80s when a NASA-commissioned study found that bouncing on a trampoline offered an effective alternative to the treadmill. Today programs like Urban Rebounding and JumpSport offer group classes and at-home DVDs that turn the fun of jumping into a seriously effective, low-impact workout. Some routines stick with strictly cardio moves like jumping jacks, high knees, kickboxing, or running adapted for the trampoline, while others combine both strength and cardio moves by adding hand weights or Pilates exercises.
Why is it still a hit? It's the perfect workout for people with lower-body issues, such as ankle, knee, hip, or low-back pain," McCall says. "The elasticity of the trampoline allows the body to move without the additional stress of ground reaction force." So walking or jogging in place on a mini-trampoline can provide the benefits of the movement without the stress of the impact.
Unlike shoulder pads and scrunchies, we're glad these old-school—but super effective—fitness trends are still going strong
Then and Now: 7 Retro Workouts That Still Get Results