actually have variation to the standard answer of the past "10"years. previously, the answer was control your diet and simply, run lor. now, the advice is that if you can take it, do something called fastleg if i didn't remember it wrong. run at top speed for say 200m, then slow down to jogging pace for the next 200m, then revert to top speed and continue this cycle. alternatively, instead of 1 continuous 30minute high intensity work-out, split it into 3 ten minute sessions with about 5 minute breaks in between. it helps to burn more fat as compared to previous long duration work outs that promote stamina.