Stairs are good if you want to get from one level to the next - whether you're going from lingerie to homewares or from bumpy to buff. Inclines recruit lower body muscles that standard floor exercises don't and improve balance, says personal trainer Jeanette Soloma. For a warm-up, walk up and down a flight of stairs for two minutes. Then pump out one set each of these four exercises, moving from one to the next without rest. Try to do them two non-consecutive days a week.

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