Stuck in an exercise rut? Understanding fitness adaptations will help you improve performance.

Open right knee, rotating through the right hip to lift knee toward ceiling. Glutes should engage.

Plus, exactly how to train to sculpt your muscles.

Jason Chun is a CNET writer covering a range of topics in tech, home, wellness, finance and streaming services. He is passionate about language and technology, and has been an avid writer/reader of ...