Over half of the people in the United States rely on groundwater for drinking water.a. True
b. False

The President's Challenge Program is a fitness evaluation designed for  elementary and high school students. So, the correct option is B.

What is President's Challenge Program?

In the United States, there is a programme called the President's Challenge Programme that encourages physical fitness and healthy living. President Dwight D. Eisenhower launched it in 1956 as a means of enticing Americans to increase their level of physical fitness.

The President's Council on Fitness, Sports, and Nutrition presently oversees the programme, which provides a range of tools and resources to assist individuals and organizations in promoting physical activity and wholesome eating practices.

The President's Challenge Programme contains programmes for adults, elderly, and people with disabilities in addition to a fitness assessment programme created for elementary and high school kids.

Therefore, the correct option is B.

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B) elementary and high school students . . .

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Answer:

It increases your bone density.

Explanation:

Impact exercise are all those which make contact with the floor. It can be low impact or high impact, the different is depending on the intensity and strength which we heat the floor, from walking to plyometrics.

Moreover, according to verywellfit, impact exercises have pros and cons, which are shown next:

Pros:

• Improves your bone density.
• Increase your heartbeat rate.
• Improves your stability, balance, and coordination.
• Strengthens your heart and lungs.
• Help you burn more fat.

Cons:

• Risk of injury when you don't have the right technique.
• It's no proper to people with articulation problems, because it can cause huge impact in strain joints, ligaments or tendons.
• For people with overweight is not recommendable due to the excess of pressure on knees and ankles.

On the other hand, bone density refers to the mass per bone volume, which is really important, because a lack of bone density mean that you can break them easily. The most popular ways to improve this is having a diet rich in calcium as dairy products, and doing low impact exercises, as walk or jog.