Fitbit // I love my Fitbit app. I have the flex, so the only thing I can see is my step progress, and even then I don't have a direct count. The Fitbit app can link directly to MyFitnessPal, which makes tracking steps and calories even easier. And, of course, the number one thing I love about my Fitbit and the Fitbit app is the sleep tracking feature! I'm going to do a post later on just on the Fitbit Flex, but for now, you can read about how much I love the app.
SWORKIT // Sworkit is a circuit training app that you can do anywhere without a gym. You can choose between five options: cardio, strength, stretching, yoga, or "fit in five." Then you choose how long you want to go, anywhere from 5 minutes to 30 minutes. I haven't found my sweet spot with this app yet, but I love the features and know that I will continue to use it over the summer when I don't have regular access to a gym. My only issue with Sworkit is all of the ads, but I'm just too cheap to upgrade to premium. ;)
FitStar Yoga // Another "no gym no problem" app, FitStar Yoga is partnered with Fitbit and synchs directly with MyFitnessPal. These workouts are definitely longer than Sworkits, but I use them as a stretch/cool down. I've wanted to get into yoga for sometime now, but I can never take it too seriously when instructors (via YouTube) tell me to "find an experience in the space" or something like that. So what I like about FitStar Yoga is that other than explaining the pose, the instructor is mostly silent, leaving you to be inside your own head.
Plant Nanny // Last but not least, Plant Nanny is a cute little app that tracks how much water you drink! You can choose the size of your glass (and change it too) and then you water a plant each time you drink a full glass of water. It's a little confusing at first, but once you get the hang of it it's super cute!