Most of us think of the Abs upon hearing core, well you're not completely wrong, just missing the Gluteal muscles and the Lats(and some other deep muscles as well that protects the spine). Yes, there are three things you want to include the next time you hurry yourself to the Abdominator machine to strengthen your core, that will be your Glutes, Lats and of course the midsection itself.
These two movements which will indefinitely challenge your core and in the process, strengthen them to avoid injuries, improve posture and move better.It's been chosen for its involvement or most bang for your buck movement to allow you to build a core that doesn't get messed around with.
The big daddy of movements, TGU
The Turkish Get Ups AKA TGU is the exercise to go to as you get a whole body conditioning with your core being involved throughout the movement. Some common mistakes you want to lookout for is the alignment of the shoulders and arms as they are the ones that needs correction by either yourself or a watchful eyes of a trainer. These have been used by elite MMA athletes, in rehabilitation context and even for pro-priorception drills. TGU allows one to be more aware of your body as that helps with athletic development for performance and injury prevention. Almost everyone can benefit from TGU as it conditions movements which includes rotation, extension(which is neglected in many programs) with core activation and increases body awareness for a total workout. Oh yeah, don't have yourself fooled by this movement, do them before your actual workout and not after as this is very demanding metabolically and is best to use as a warm up movement. Don't take our word for it though, try them out for yourself. (Start the picture from left to right, repeat your way down the same way you got up)
BB Front Squats
There is no arguing over this as back squats mechanically loads up the posterior chain much more than the anterior part. If you want to have big, and we mean BIG mean thighs with extremely strong functional core, then you might want to start loading those wheels with this movement. They give variety to your program and help to offload your spine from all those back squats. FS as well gives you an added mobility onto the wrists, and thoracic extension which all play a big role in athletic development. When you start loading the bar in front squats, you turn on the core as it needs to stabilize the load that is pulling you forward by extending your trunk and upper body in an upright position. Work your way up to at least 1.5-1.8 x of your body. A great way is to squat twice a week with back squats and front squats done in two different sessions so that you can offload your spine every week and get your BIG thighs and super strong core as weeks passes by. The only thing is, if you are new to FS that you will encounter some problems with the racking position(mobility issues) but that can easily be countered with straps to help you, if not just man up and work your way through till it eases off that it is not a problem to get in the FS racking position.
PS: Don't cross your hands in front of you, instead do it with your fingers under the bar like the video!