After having cardio incident I started to walk and slowly running. However to run in specific pace with steady heart rate and distance was a challenge. Until I purchased heart rate monitor strapped one that had this Runtastic app connect. Its best pair I have found for to build strength, stamina and endurance. I keep my every workout details and its awesome help and accompanied I have.
I LoVe it
Cardio survivor about adidas Running: Run tracker, v6.9