Happy Day 4 of F45's Fitmas challenge! 🎉 Today's exercise is pull-ups! Challenge yourself and see how many pull-ups you can do in 45 seconds! Remember to post your results, tagging F45_Training and using the hashtag #F4512DaysOfFitmas. 📲💪 Let us know how many pull-ups you think you can do in the comments below! 👇 💙👇 . . . #F45Training #F45 #F45Challenge #FitnessJourney