The obliques are a very important muscle if you are involved in any activity
with a rotational component. Since many sports such as tennis, baseball,
football, kickboxing, etc. heavily involve transverse plane (rotational) motions
the power sled torso twist is probably the most functional, sport-specific
exercise you can choose to do for your obliques. Of course if your goal is to
help develop more power for those swings, throws, kicks and/or punches you need
to do in your activity, performing the power sled torso twist explosively is
going to benefit most. If you are simply looking to tone your mid section, you
can slowly perform this exercise although it may not be the most natural
feeling.