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Originally Posted by mvega325
about 4 days a week i do Cardio at the gym ... i run on a no impact runner for 30 mins (+5 mins cool) i average about 180 strides a min and burn about 375-400 Calories. i run about 4 miles ... I'm never out of breath but i do sweat .. should i step it up .... i hate spending 2 hours at the gym ... i just don't have the time ..any advice ... should i move to a bike ??? stair master ??? i want to get the best workout I can in 30 mins .. i have a leg injury so i try to stay low impact ..
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If you need low impact I would move to a road bike ( not an indoor bike ) the only concern would be your time constraints. You will not hate spending time on a road bike like you do in a gym on a stationary bike.
As for calories while cycling, on avg you will burn as little as 700 per hour and as much as 1200 per hour, depending upon intensity. So on a bike for 30 minutes you could burn 600 calories (based on avg) depending on intensity. For a comparison, TDF riders burn up to 9000 calories a day.
As a runner with an injury, you should know what your paces were before you were injured; make appropriate reductions to those paces when you return and run by pace, not by how your breathing or heart rate is.
As far as fitness transfer goes, always assume that your training is specific to what you are doing: to improve your run, you need to run...etc.
There is a small amount of fitness transfer from running to cycling (and not vice versa), but only if your fitness level is quite low. IOW, the more trained you are in any sport, the less and less cross-training will effect your fitness in your sport of choice.