Which Small Change in Physical Activity Is Easy to Accomplish

Which small change in physical activity is easy to accomplish and will most likely be acceptable?

A) Park farther from class, the store, or the office and walk.
B) Take up weight lifting.
C) Stop watching programs on television or computer and go jogging instead.
D) Do as many sit-ups and push-ups as possible in the morning and before bed.
E) Jump rope for 20 minutes per day.