A few of words of caution, from someone who has been there, done that.
First, there are diminishing returns. Aerobic exercise -- particularly long sessions with moderate intensity -- will burn muscle as well as fat. If you're not lifting and eating sufficient protein to maintain muscle mass, you'll end up smaller but flabbier.
Second, if you don't give your body time to rest and heal, you put yourself at risk for an overuse injury (e.g., tendonitis, bursitis). This will put you out of commission and stall your progress. Not saying everyone will get an overuse injury from two-a-day cardio workouts: it depends on your starting point (more in-shape people can manage more stress on their bodies), age, diet, and just plain old genetic factors.
Third, mental fatigue. Any program gets boring, but two-a-day cardio sessions in a gym are a recipe for mental burnout. You may last a day, a week, a month, or maybe a year (probably not that long, but it fits the tune of "friends" better). But, you're in this for the long haul, no?
If you have a base of conditioning already, try mixing HIIT (high intensity interval training) into your cardio routine. 12 minutes of HIIT can do more for conditioning and fat loss than 90 minutes of slogging on the elliptical.
b. strong,
Kim
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