There’s a lot more to it than “they just do” we just don’t know yet because there’s actually a lot we don’t understand about the fundamental properties of, well, fundamental particles.

See the higgs boson as for why matter has mass. We used to say “inertia is a property of matter” but some clever fucks figured out why and then proved it.

Stretch, focus on muscle groups in your hands or arms or shoulders or neck if you can’t get up, back or hips or calfs or ankles if you’re standing