The answer is the placement of the load and the placement of the force applied.
A healthy adult heart rate can range from 60 to 100 beats per minuteduring rest. Kids' heart rates can be as low as 60 beats per minute during sleep and as high as 220 beats per minute during strenuous physical activity.
1. aerobic means "with oxygen" and anaerobic means "without oxygen"
2. aerobic can mean small exercises meaning you aren't using too much of your body's muscles and bones to workout. Anaerobic can mean big exercises meaning weight lifting.
3. With aerobic exercise the oxygen is carried through your breath to the muscles giving them the energy they needed. This is basically an example of a warm-up before an exercise. Anaerobic however makes you out of breath quickly because without doing the warm-up and you just go into the workout you are making yourself weak and not have enough energy.
Hope this helped :)
<span>To get into shape for the incoming softball season, Crystal, who enrolled into a hip hop dance class and targets that her heart rate be 142-180 beats per minute. With her current heart rate of only 125 beats per minute, she should dance at a faster pace. Thus, the answer to this item is letter A given that the duration of her dance is fixed at 45 minutes. </span>
