A lot can be done while comfortably sitting in your chair and one of the simplest exercises to try is crunches in a seated position. Sit on your chair's edge with hands firmly behind your head.

Seated Knee Raises This exercise focuses on the core, strengthening the abdominal muscles without the need for traditional ...

Heather Milton, a senior exercise physiologist at NYU Langone Health, does not recommend sit-ups or crunches for building your core because they put your spine through unnecessary stress.