Strength training works by creating microscopic tears in the muscle fibers. which then grow back stronger. But it takes time for this to happen, which is why most experts recommend resting 48 hours between strength training sessions.
The core muscles are no different from any other muscles - you need to rest them between strength training sessions. And doing a different exercise does NOT constitute rest.
Seriously, there is little benefit to strength training every day - your muscles never get the opportunity to rest and recover.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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