查了一下... micoach-fit-smart .. http://www.cnet.com/products/adidas-micoach-fit-smart/ "but it doesn't render the tracker completely waterproof, so swimming is out of the question."
out of "the" question... 再查一下國中字典... 是... "不可能的,不值得考慮的" .... so... 如果要記錄心跳可以游泳的解決方式, 似乎現在還沒有?