Body fat levels for elite male sprinters?

I have found this to be the case with low intensity work in general, not specifically with ab work (I haven’t tried). Better recovery and athletes lean out with less effort and ‘micromanaging’. Perhaps the effect is similar to that when people add a 30 minute walk at night to their training and find themselves much leaner in the time frame you mentioned.

Do you believe the effect comes from the specific exercises (i.e. targetting the midsection) or simply through a large volume of work that does not directly compete for CNS reserves or utilize the prime movers?

Thanks.