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I have a low average BMI and extremely small bones but have always had a squishy, wobbly, weak body all over. I had dinnerlady arms by the time I was fourteen. I don't have any weights to lift or want to spend much money, but I've been doing squats, wall push ups, holding a floor push up position for 50 seconds, etc., 3-4 times a week after my new five minute high intensity run (very new - started four days ago). The resistence exercises normally take about 35 minutes when the flexibility and balance work is subtracted.
How much more than five minutes running can I let myself get up to all the time I haven't yet achieved a tight, athletic body, without endangering my muscle gains? I want to take part in a fun run in October without having to walk any of it. Would the amount of cardiovascular training I'd have to do necessarily halt my progress if I don't increase my current levels of resistence training along with it, and would focusing on speedy short and middle distance running for several months give me the endurance to run non-stop for 5K?