Combined with the watch’s step-counting, Apple (and Lark-like software) could potentially be a real boon for those at the left tail of the fitness distribution, who just need a little extra coaching.
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SOURCE:
https://medium.com/the-ferenstein-wire/hands-on-considering-an-apple-watch-for-fitness-your-iphone-already-has-the-features-4341b3c2965