The 650 skeletal muscles in the human body contract when they receive signals from motor neurons, which are triggered from a part of the cell called the sarcoplasmic reticulum. Motor neurons tell your muscles to contract and the better you become at having those signals tell your muscles to contract, the stronger you can get.
A-engaging in social activities
I suggest, if this is a laptop given to you for school purposes, that you search through all the things downloaded on the laptop. You may find a screen sharing device or an application on the computer that allows the school to monitor your screen or what you've accessed. If you don't find anything of the sort downloaded on the computer you may be fine, although i would suggest doing small things at first, like scrolling through images or having multiple tabs open, so if it turns out they can see your screen you wont get in too much trouble. If nothing happens you may be fine. I do online school on my own laptop and no ones stopped me from tabbing around during lessons, but who knows. Good luck, fam.
