yeah Karl the results are great but like stated below, you need to remain dedicated to the diet... your cv will defo improve over the period , ive done the insanity and also the next one called Asylum.
It is very hard (but then I'm old so I have an excuse)
It is very effective
It is motivating (you see people quitting to take a rest in the vid so it makes you feel better when you have to!)
You don't need ANY equipment
You do need to devote time to it (40 mins - up to an hour, six days a week)
It made me tell my TV to f*ck off! (more than once).