If possible we will do some off feet conditioning, mobility, single leg work, upper body pump and extra core work Game day + 2 to help with the recovery process. (rugbystrengthcoach.com)
The beauty of using a stability ball for chest exercises is that you get extra core work at the same time you work your chest muscles. (all-about-arm-exercises.com)
If you're short on time and want extra core work you need to step away from exercise machines. (thrivepersonalfitness.com)