Question

it is possible to the effects of regular physical activity by altering the type, duration, frequency, intensity, or progression of exercise. match the tuations to determine whether they are describing increasing duration, frequency, intensity, or progression of exercise.
bill was swimming for 30 minutes, 3 days per week and recently increased that to 45 minutes, 3 days per week:
sonya was participating in one aerobics class per week and recently increased that to two aerobics classes per week:
erin was walking on the treadmill at a rate of 3 miles per hour for 60 minutes and recently was able to increase that to 4 miles per hour:
chris used to do 30 minutes of cardio at 50% of his max heart rate 2 days per week and has gradually increased his performance such that now he is exercising for 60 minutes at 80% of his max heart rate 4 days per week:

Explanation:

• For Bill: The change is from 30 minutes to 45 minutes of swimming while keeping the frequency (3 days per week) the same. So, it's about the length of time spent exercising, which is duration.
• For Sonya: The change is from one aerobics class per week to two aerobics classes per week. This is about how many times the exercise is done in a week, which is frequency.
• For Erin: The change is from 3 miles per hour to 4 miles per hour on the treadmill. This is about how hard the exercise is (speed is related to intensity of walking/running on a treadmill), so it's intensity.
• For Chris: There is a change in multiple aspects (duration from 30 to 60 minutes, intensity from 50% to 80% of max - heart rate, frequency from 2 to 4 days per week). This overall improvement across different components is progression.

Answer:

Bill: Duration
Sonya: Frequency
Erin: Intensity
Chris: Progression