for two minutes by picking up your pace. Your breathing rate should remain the same. Walk or jog on the flat for two minutes. Repeat the sequence three to six times.Reach Your GoalsDo the right combo workout to hit your goals:Aim: General fitness

in intensity, then peaks and slows. "Vigorous exercise yields the greatest health benefits," says Pierce.Here's howDo drills, then pick up the pace. Jog for five minutes and do 25m each of knee lifts and rear kicks. Then, for five minutes, increase your speed

much oxygen they can take in, but how efficiently they can use it when barrelling along at race pace. This is known as your 'running economy'.To some extent running economy is genetic, but it can be improved. Early in Paula Radcliffe's career, she