4 USING BUTTONS
By pressing the following buttons, you can access the following features: 
(PLAY/STOP):
●select exercise, history & trend, prev. exercise
●start/stop exercise
●increase/move up
(NEXT):
●switch views
●enter/exit settings by keeping pressed
●accept/move to the next step
(LOCK):
●lock 
button by keeping pressed
●decrease/move down
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