What most naturally follows?

How to exercise with friends
Choose friends you want to spend time with.
Becoming exercise buddies is a big commitment. You will be spending time together each week for long stretches of time.
The two (or more) of you should enjoy each other's company, and commit to supporting and motivating each other. You will have to know that this will make a very close bond between you and the workout friends, since you are sharing the same physical exercise.