Answer:
When you don't have proper body alignment, then the curl ups could be too easy or too hard.
This could also cause injury, due to improper stretching of the muscles.
Some tips would be: (<em><u>You may choose any two of them</u></em>)
1.) keep your feet about 12 inches/1 foot aways from your bottom.
2.) Stretch properly before doing curl ups to prevent injury.
3.) Lay on something soft to prevent spine aching/injury.
4.) Instead of putting your hands behind your head, put them in an X shape across your chest. This can prevent neck injury or aching.
5.) Don't let your feet lift off the ground, have a friend hold them down. Never put gym weights on them, as that can cause injury to your feet.
You will die and you could get lung cancer and yeah DO NOT SMOKE DAILY
it is bad real bad.
I hope this helps I tried my best.
True it is also the smallest passage in the human body
Its obviously wrong. And the right desicion is to say no, and try to explain that it is wrong for them to even have it. But its your own desion, just try to make the right one.
Calcium is what you should look for to strength your bones, therefore leading to a better growth development.