250+ Gym Captions For Instagram That Will Help You Stay Motivated, Celebrate Gym Partnerships, And Make Your Fitness Posts Even Better. We've put together some captions , quotes, and song lyrics for you to choose from. Here are 75 of the best gym captions to get your followers pumped and get you all the likes. Need gym captions for Instagram? Check out our list of captions that will keep your fitness -loving followers interested! Looking for the perfect gym captions to match your post-workout selfies, muscle flexes, or sweaty grind moments? Whether you’re crushing PRs, hitting cardio milestones, or just feeling yourself after leg day, the right caption can amplify your post.