5 mph for 5 mins, then 5.5 mph for 10 mins, ?5 mph for 5 mins again.
I hope that my heart rate would stay around 155 bpm呻疹,but it seems not so easy.
5 mph for 5 mins, then 5.5 mph for 10 mins, ?5 mph for 5 mins again.
I hope that my heart rate would stay around 155 bpm呻疹,but it seems not so easy.