http://i.imgur.com/WV7sklD.png?1
We were going to use the last icon before the iOS7 redesign came. The first tree are redesigns of the original icon with different level of flatness.
Training routines are a central theme on the app, hence the clipboard and the paper sheet on the icon.
The MT stands for MyTraining (www.mytraining.pro).
What's your favorite version?