Answer:
Regular physical activity can improve your muscle strength and boost your endurance. Exercise delivers oxygen and nutrients to your tissues and helps your cardiovascular system work more efficiently. And when your heart and lung health improve, you have more energy to tackle daily chores.
I’m sorry but you didn’t list any options. Sorry, I can’t be of help.
Rasing and lowering the body to a 90-Degree angle at the elbows with a flat back. Would be the correct way for doing a push-up.
Answer:
Proof of 
is shown below.
Explanation:
The given equation is
To prove : 
Proof : Let as assume,
...(1)
...(2)
...(3)
We know that
Using (1), (2) and (3), we get
On comparing both sides, we get
Hence proved.
