The guillotine press – where you bring the bar down to your neck instead of the lower pecs – is a great chest developer. But there is risk. Keep these light and under control. This is not a bench press variation to go heavy on. And don't try to set a PR! This is bodybuilding, not powerlifting.
My favorite way to use it is 6 x 6 with 20 second rest periods between sets.
The glutes play a larger role in sports performance than just keeping your jock from falling down. As part of your posterior chain of muscles, properly trained glutes can help you jump higher and sprint faster.