SURE, YOUR WORKOUT SESSION’S OVER. But that doesn’t mean you don’t have enough left in you to challenge your workout partner to a little friendly competition. Throwing a little pride into the mix is a great way to kick your motivation up into the next gear.

We talked to Ben Musholt, a physical therapist in Portland, OR, for more than 10 years and the founder of Strength Mob and BPM Rx Inc., about some easy ways to challenge your gym buddy and yourself. When you think you’re running on empty, test yourself and your friend, and you’ll be surprised how much strength you dig up.