The answer is marijuana, i'm not sure if this is correct
Hope this helps! :)
Happy New Year
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.
Answer:
same its prbly bc u dont sit up straight tho
i hope u feel better!! :)