Rick is a healthy 17-year-old high school student who is 70 inches tall and weighs 205 pounds. He has decided to "get a six-pack" over the summer with a diet and exercise program. As part of his new plan, he has stopped drinking soda and is eating more salads in addition to his usual diet. Besides of these changes, he is unclear on how to proceed to reach his fitness goal. Rick’s mother wants to make sure his approach will not interfere with his normal growth and development, and has asked him to seek reliable information to help him make a reasonable plan.
1. What is Rick’s BMI? SHOW WORK FOR FULL CREDIT
2. What is Rick’s weight category?
3. Based on his BMI, in what range is Rick’s body fat likely to be?
4. Suppose Rick wanted to reduce his BMI to 27. What would his target weight be? SHOW WORK FOR FULL CREDIT
5. What is Rick’s BMR at his current weight? SHOW WORK FOR FULL CREDIT
6. Suppose Rick engages in light-to-moderate intensity weight lifting. How many calories will he expend per hour of activity? Use his current weight in your calculations. SHOW WORK FOR FULL CREDIT
7. If Rick swims for 30 minutes at a speed of 45 yards per minute, how many calories will he expend?

1. Rick's BMI is 29.4

2. Rick's weight category is upper range of overweight

3. Ricks body fat based on his BMI is in the range of 27-32%

4. Rick's target weight should be 188

5. Rick's BMR at his current weight is 1961

6. He will need to expend 295 calories per hour of activity

7. He will need to expend 357 calories

Explanation:

1. Body Mass Index is a simple calculation using a person's height and weight. The formula is BMI = kg/m2 where kg is a person's weight in kilograms and m2 is their height in metres squared.

Therefore Rick's BMI is:

70 in / 39.37 = 1.778m

205/2.2 = 93.2 kg

BMI = 93.2 / 1.78*1.78 = 29.4

2. A BMI of 25.0 or more is overweight, while the healthy range is 18.5 to 24.9. Rick falls in to overweight category on the BMI chart.

3. A BMI between 18.5 to 24.9 falls under the normal weight range. Anything under 18.5 would falls into underweight, whereas anything over 24.9 falls into overweight category. If one has a BMI over 29.9, it is considered as obese.

Therefore Rick's BMI of 29.4 puts him into upper range of overweight category.

4. 188

5. Basic metabolic rate (BMR) is the amount of energy (in the form of calories) that the body needs to function while resting for 24 hours.

The formula for calculating BMR is:

BMR = (height in centimeters x 6.25) + (weight in kilograms x 9.99) - (age x 4.92) + 5.

Therefore 70÷2.54= 178cm

205÷2.2=93.2kg

So, (178 × 6.25) + (93.2 × 9.99) - (17 × 4.92) + 5

= 1961

6. 295

7. Calories burned swimming:

To calculate calorie per minute: MET x body weight in kg x 3.5) / 200.

Then multiply calories per minute by total time of swimming

= 357