YO SOMEONE HELP ME 1. Obtain your maximum heart rate (MHR) 220 by subtracting your age from 220.
2. At what percent of maximum heart rate do you wish to train? The lower limit is 60% for training effect, and the safe upper limit is 90%.
3. Multiply Step 2 times the value of Step 1. HRR X 50% and HRR x 85%
4. A is results lower limit of target heart rate zone for training effect, and B is the safe upper limit.

1You can calculate your maximum heart rate by subtracting your age from 220. For example, if you're 45 years old, subtract 45 from 220 to get a maximum heart rate of 175. This is the average maximum number of times your heart should beat per minute during exercise.

2To be effective, exercise should be at the right intensity (about 60% to 70% of your maximum heart rate) for your age and fitness. In other words, it should not be too easy or too hard. You also must exercise long enough (20 minutes or more in your zone) to burn enough calories to lose weight.

3i dont know about this one

4It is possible to exceed the upper limit of your zone without any ill effects, as long as you do not have coronary artery disease or are at risk for a heart attack. What it may do, though, is leave you with a musculoskeletal injury. Exercising above 85% of your target heart rate could bring you sore joints and muscles.

Explanation:

to increase speed you need to decrease frictiona dn drag hense why sprinters wear tight track suits to keep tight against there skin to keep away from wind and decrease the amount of drag you are carrying.a swimmer will wear the tightest swim suit they can possibly fit into (i was a size 28 swim suit at meets i wore a   size 23) why? because the tighter your clothing is the less drag and negative force you have. the heavier the clothe the slower and more wind gets caught. cotton tends to hold onto alot of sweat and water making it slower then say a track suit (no idea what they are made of but they are really comfy around your answer )