Join the 6-week weight loss challenge: https://briansyuki.com/your-challenge/

Doing crunches and sit ups is not going to help you lose belly fat.
Do these 3 exercises instead. These exercises are effective for losing belly fat because they target different muscle groups at the same time.
It's important to maintain a healthy diet when trying to lose lower belly fat so combine these exercises with the 6-week weight loss challenge.
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