Stable v3.0

Changelog:

• Added gender, age and weight (just kg for now) settings, you have to set them if you want accurate kcal measurements
• Added avg, min, max hr and kcal measurement, watch them on settings - latest training
• Fixed a minor bug (If you cancelled timer from prepare screen it would keep going)
• Added an option to extend preparing time to 1 minute, this way you can start timer and then start an activity, so activity will be recorded and you'll have interval timer

Bugs:

• If you find any, open an issue and include logcat if possible