Suggested Caption:
Space Cycle is an artificial gravity exercise gym that enables the rider to perform resistance-training exercises without the use of weights. To achieve the desired amount of force, the rider on the left powers the cycle while the rider on the right performs squats.

Photo courtesy of V.J. Caiozzo, University of California, Irvine.

Suggested Caption:
The human-powered centrifuge generates various levels of artificial gravity ranging from 1g (Earth gravity) to 5g (five times Earth gravity), where the speed of rotation determines the level of gravitational force. Here, the rider is experiencing approximately 3 times the force of Earth's gravity.

Photo courtesy of V.J. Caiozzo, University of California, Irvine.

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