There are fast twitch muscles fibers in all of your muscles, especially in your legs.
You can get a twitch from stimulation or damage to the muscles.
Slow twitch
when muscles twitch
fast-twitch NOT slow-twitch
because it makes you react quickly by using fast twitch fibres in your body which makes your muscles react.
Well, I'm not completely sure of this, but in my science class we were talking about slow- twitch muscles (like your esophagus for example) and fast twitch muscles (like your leg muscles). Anyway, I asked do sloths have slow twitch muscles in their legs, and he said to look it up, so I did, and it turns out they do! So the reason is they have slow twitch gastrocnemus (calf) muscles!
Cheetahs have mostly fast-twitch muscles, which allow them to achieve high speeds in short bursts during hunting. These muscles facilitate rapid acceleration and swift movements, making cheetahs the fastest land animals.
probably, because your muscles twitch because they don't know what to do but twitch. not for long though.
Slow-twitch
Fast-twitch fibers can deliver a quick burst of power.Slow-twitch fibers can maintain a contraction for a longer time! -Apex :]
Type I muscles