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Doing the triangle crunch correctly will allow you to build your oblique muscles. This oblique exercise is ideal for beginners. But to get the most out of it you must focus on squeezing your oblique muscles every time you tuck your knee in.
Once you learn how to do triangle crunches, it'll be much easier for you to build six pack abs because you'll have more core strength, allowing you to do more challenging ab exercises.
This is one of the best exercises you can ever do.
The triangle crunch exercise is very easy to master and you can get it right after the first few tries.
Use this video to learn how to do triangle crunch exercise correctly.