Our expert says:
Not 100% sure, I suspect it's not far off in terms of energy expenditure. I've always found the movement quite constrained and unnatural, and so never really felt that for a long workout, it offers the same benefit. The elliptical movement of the legs is quite unusual and therefore I believe might predispose to overuse injuries if you are not careful and do too much too soon.
But as part of a training programme, that consists of a mix of cardio training types, I'd find it difficult to pull them apart. But as a focus of training, I don't think it compares.
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