Walk into a gym and you’ll probably spot people doing one of two types of cardio. One is training flat out in short bursts, while the other is taking it slow and steady.

Certified trainer Mia Green falls firmly into the second category. The Oner Active athlete prefers to leave the intervals, fartlek and lactate threshold training for runners.

Instead, the 23-year-old says you can boost stamina, respiratory fitness and muscle simultaneously using nothing but the stair climber. You may like

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