This is our next 15 second challenge. Join us. It is a great exercise for your triceps. See how many cross hand push-ups you can do? Just: 1) video it 2) post it 3) tag it #United4Fitness and #15secofchallenge 4) Enjoy! #joinin #joinus. We are a small team of #fitnessenthusiasts with the pure goal of motivating each other and being motivated by you. #machmit #pushups #sunset #crossarmpushups #tricepworkout #trizeps #fitness #workout #gymrat #flex #gymmotivation #gymbody #shredded #inspire #selfie #fitfam #fitgang #motivation #15secondfitness #u4f















