Can your pal meet to exercise on a regular basis?
Is your partner supportive (not disparaging) of your goals?
And last, will your bud be able to keep up with you or even push your limits in key workouts?
Here's a snack for your brain:
The average romp in the hay is equivalent to a short jog.
Researchers at the University of Québec at Montréal measured energy expended during sex versus running, and found that we get our hearts pumping and muscles cranking enough during sex for it to be considered moderate exercise.
My advice is definitely choose your exercise buddy carefully.