Anyone have a garmin 310x

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wasn't sure where to post this.. i got a garmin 310x from my best friend as a vday present.. i am trying to figure out how to use the hrm for other exercises besides running..

i have read the manual, but im still lost.. . does anyone know? this watch does so MANY things.. i am wanting to track calories burned like for insanity shred so i want to just use it as a hrm. it has the strap with it.

TIA