Posted 5/9/2017 3:18 PM (GMT 0)
It's hard to just answer one question like this, but it could be the nerves continuing to misfire, or it could be from the muscles themselves and the amount of movement that they are doing - since you said it happens when you walk a lot.
Mine are much more random, but if I have to be on my legs for long, it means they will be twitching and cramping for a while afterwards as well.