One piece of equipment. It’s light and versatile. And many clients already have it. A Fitness ball (Swiss Ball, Stability Ball), you know that big round thing. Exercises range from simple crunches to complex mountain climbers and straight leg jack-knifes. Great for core, legs, arms and chest. Have a client do a regular push-up, then the same push up on a Fitness Ball. The instability forces you to use all those wonderful connector muscles. And when you use a Fitness Ball, EVERYTHING has to come to the party. Of course it’s up to you to be creative, create a pace and flow, maybe some great music and crank out an amazing workout.