Originally Posted by SiM
You work out your maximum by subtracting your age from a fixed number (220 iirc)... Its a crap approximation though...
It "officially" goes something like this iirc.... 60% of maximum is "best for burning fat" and 80% is "best for cardio"... I believe that is nonsense and its best to do
HIIT for both cardio and fat loss
Another recommendation for HIIT, however you need a decent amount of fitness in the first place to be able to cope. It's extremely punishing in every respect but does give you the best results. This is one of the reasons why Kickboxing/TKD type sparring is brilliant for fitness, because the way it works is pretty similar to a HIIT workout.