very useful tool

Used fitpal to adjust my interval training sets and training time. Id say if you hapen to use interval training crazy like me you better measure your heart with fitpal. After I changed my training time with FitPal and tweaked my rest time between sets by checking dynamics of my functional capacity, I really feel the difference! I enjoy my training a lot more and feeling my heart is working better, like a car engine that was warmed up. Just try it yourself!

Robert Corman about Fitness Capacity Test