Fitloop - Bodyweight fitness workouts for everyone
QuizUp - QuizUp gives you the opportunity to test your trivia skills against friends and strangers throughout the world.
Hevy - Simple workout logging, insightful analytics, and a growing community of gym athletes.
2016 Photo Challenge - Take a photo every day for 366 days
Fitbod - Personalized Strength-Training powered by Machine Learning
Woolah - Knockout Photo challenges with your friends.