You can't escape #fitspo on social media–especially when you follow celebrities (even the ones that hate working out!). While it's all too easy to roll eyes at the glistening abs pictured in someone's gym selfie, you can't deny that those endorphin-fueled smiles and triumphantly raised, toned arms give you a little FOMO. Here, get motivation to book your next fitness class with 21 photos of stars looking accomplished and SO happy to workout.