In-line skating at a moderate intensity (130-pound person) for 30 minutes can burn approximately 217 calories.

Cardio (In-line Skating) Active Lifestyle

Muscles Worked
Thighs (front) or Quadriceps,
highs (back) or Hamstrings,
Butt or Gluteus Maximus/Minimus,
Calves or Gastrocnemius and Soleus

Position and Movement
Keeping your body as upright as possible, push off with one leg to help start yourself moving forward. Alternate pushing with each leg. Once you get a steady rhythm, maintain this pace to keep yourself moving.

Tips
Use your arms to make the movement more efficient and to get some upper body exercise.

Consult your physician before starting any diet and/or exercise plan.