Strength training builds muscle and creates more mitochondria, while interval training improves mitochondrial function and how quickly they burn oxygen and calories. (mindbodygreen.com)
The heart is a muscle and regular cardio exercise builds strength in the heart, just like weight training builds strength in our other muscles. (mystrengthtraining.com)
Weight training builds muscle much better than cardio does, so including resistance training in your fat loss program will give you great results. (instantknockout.com)