As little as 10 minutes in the sun gets your metabolism up and humming. It’s the mitochondria inside your stem cells stretching their ribosome things towards the cosmic light. Or something like that. 

Ok, no idea why it works, but it does, ESPECIALLY if you step out of a meeting to “pick the document off the printer” and run outside instead.  Friday’s dare: in the middle of some soul killing task/meeting/email/call, just quit and go outside. Take 10 minutes in the sun before returning. If possible, do this while outside (if not, anytime is ok):

15 squats, then skip for roughly the length of a basketball court, 15 squats, skip back, 15 squats. 

Skip with courage, joy, and good high knees.