Elliptical Machines - Please help

[Milo]

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I can't run for more than 10-15 minutes but can 'run' on an elliptical for 45. Why is this? Should I work on gaining endurance running because the gains are much better?

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Gain endurance any way you can. You build base by LSD workouts and the elliptical or a bike are perfect for this. Running is very hard on the body, and until one is leaner and stronger, less damaging workouts like swimming, biking or elliptical will allow for more gains.

When you do start running, don't be shy about doing run/walk workouts.