| Situps might be one way to strengthen some core muscles. |
| Is he 21? |
| I think it relates to autism/ADHD and other low-muscle-tone / sensory-seeking conditions where maintaining good posture is a challenge. |
| My version of this is resting my feet on a pretty tall stool under my desk at work. I've started wondering if it was related to poor core strength, even though I dont tend to think of myself has having a particularly weak core. |
| Poor core strength. |