"Four popular cross-training modes are cycling, swimming, elliptical exercise, and stepping. All are low- or nonimpact exercises that provide excellent aerobic workouts. That makes all of these valuable training options for runners. The elliptical trainer and the stepper in particular are good substitutes for running when running isn’t possible—when you’re injured, for example. But apart from reducing the volume of impact, working on these machines won’t add anything to your running that running itself doesn’t provide. Of the four cross-training options above, only one effectively works muscle groups that are complementary to running: cycling."
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*NOTE: One thing we don't agree with... indoor cycling is boring. HA This guy must not have come to BYKlyn!