5 mph for 5 mins, then 5.5 mph for 10 mins, 5 mph for 5 mins again.
2015-7-1
I hope that my heart rate would stay around 155 bpm，but it seems not so easy.
5 mph for 5 mins, then 5.5 mph for 10 mins, 5 mph for 5 mins again.
2015-7-1
I hope that my heart rate would stay around 155 bpm，but it seems not so easy.
5 mph for 5 mins, then 5.5 mph for 10 mins, 5 mph for 5 m...
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