Successfully complete the indicated task to unlock the corresponding activity:

Balance Bubble: Successfully complete Balance Bubble on the Beginner setting.
Free Jogging: Successfully complete the Island Lap several times.
Free Step: Play Step Plus Aerobics several times.
Snowboarding Slalom: Accumulate two hours of total game time.
Step Plus Aerobics: Play Step Aerobics several times.
Tightrope Advanced: Successfully complete Normal Tightrope.
Tightrope Super Advanced: Successfully complete Advanced Tightrope.