(Image credit: Getty Images) If you’re someone who does core workouts regularly, it’s definitely wise to have a lot of different crunch variations in your exercise arsenal to keep things fresh. I always take note when I come across something that looks new and interesting so I can mix up my training sessions. The "crunch smash" is a move I came across on the Instagram account of fitness trainer Kyle Knapp , who is well worth a follow if you’re looking for interesting workout and exercise ideas. It’s a variation on the crunch that adds a twisting move as well as a "smash," and from my initial testing of the exercise, it’s both effective and enjoyable for boosting your core strength. Article continues below You don’t need any equipment to do the crunch smash, but if you’re lying on a hard floor, rolling out the best yoga mats will certainly make the move more comfortable.…