How Extreme Fitness Routine Can Work For You? Extreme fitness can also help you to be an aerobically superior. Extreme fitness also helps athletes to be more powerful, stronger and faster and be at the top of their game. Here is some information about extreme fitness in three different fitness routines. in Public bookmarkswith drugssupplement.comextremefitnessroutinesby 2 users Note: Extreme fitness can also help you to be an aerobically superior. Extreme fitness also helps athletes to be more powerful, stronger and faster and be at the top of their game. Here is some information about extreme fitness in three different fitness routines.