If I get a FitBit: heart rate-based interval training that combines cardiovascular and strength work set to motivational … - Tap the pin if you love super heroes too! you will LOVE these super hero fitness shirts
Excited to try this tomorrow. I love the "base pace/tempo pace/SPRINT pace" idea instead of the HIIT guides. This allows you to set your own sprint workout without feeling like complete death, but knowing if you're really working or not.