Relative strength is the amount of strength to body size, or how strong you are for your size. Absolute strength is the maximum amount of force exerted, regardless of muscle or body size.
Absoulte strength denotes the total amount of force an athlete can produce, regardless of bodyweight or size, and it is measured the same for any individual, while relative strength denotes the amount of strength an athlete has when compared to his body weight.
BMI is a measure which takes into account a person's weight and height to gauge total body fat. BMI is found by taking your weight (in kilograms) and dividing it by your height squared (in centimeters). A person with a BMI of 35 would be classified as obese.
