Select the correct answer.
Jill wanted to get in shape so she started walking 30 minutes every day. At first it was hard, but now it is easy. Which of the following
recommendations should you NOT give Jill?

A. She should now try walking 30 minutes along a hilly route
B. She should keep doing the same thing and enjoy the fact that she reached her goal
C. She should now try walking for 10 min, then running for 10 min, then walking for 10 minutes
D. She should try walking the same route, but now try walking faster