How can I be able to sit for longer time ?

[Biscuit]

muscle imbalance relatd to being underweight too. both the SLEs were very skinny before they bulked up but the problem somehow persisted - this is bc common exercises dont address muscle imbalances, and what happens is that the imbalance just kind of gets worse, since active muscles become stronger, and u cant activate the weak ones anymore, since the strong ones wont get weak enough to the point ur body needs to recruit the inactive ones, which u cant exercise so much to restore if u dont address them directly, which is an incredibly complex process, bc to do so as i said u need to weaken/deactive the active ones which u have been making stronger and tense while exerising.

Well I'm skinny since birth ( but not a skeleton too )

Thank you so much