Crunches aren’t just difficult to master, but they only target a selection of isolated muscles, your abdominal muscles. This may be beneficial if you’re just headset on getting abs (although your diet is key here), but if you want total core strength, avoid them. A celebrity fitness trainer suggests adding this one exercise to the start of each of your warm ups instead, and it won’t take you any longer than five minutes.
The fitness trainer in speaking is Dave Rienzi, who’s trained the likes of Henry Cavill and Dwayne Johnson, so it’s safe to say he knows a thing or two about building a core of steel. You don’t need any home gym equipment either as it’s a bodyweight exercise.
