When beginning an exercise program, people with asthma should always .avoid activities that use increased oxygen levelsb. monitor their levels of glucose very carefullyc. plan a steady progression of exercise intensityd. skip the warm-up and cool down periods?

c. Plan a steady progression of exercises intensity.

Explanation:

The progression in the exercise allows the increase in fitness level. Adequate warm-up that includes joint, muscle and respiratory exercises is very important, as well as races with progressive speed increase

It is essential to do some stretching and run slow runs to condition the body. Ideally, control the breathing during warm-up to create a positive environment when practicing physical activity.

oxygen +1 most likely

geologic time scale (for gradpoint) =)