Today's exercise was sent to us from fitness expert Cindy Whitmarsh, an author, television personality, studio instructor, and nutrition and fitness consultant to athletes. We look forward to weekly tips and exercises from Whitmarsh throughout busy season. Read her tip about getting and staying motivated.

You can do the chair sit-ups right at your desk, no special equipment is necessary.

• Slouch in your chair.
• Sit up tall in your chair.
• Squeeze shoulder blades and abs.
• Relax.
• Repeat 20 times.

About the author:

Cindy Whitmarsh is a 17-year veteran fitness professional. She has a bachelor's degree in corporate and community fitness/nutrition from North Dakota State University, and she holds credentials of ACE Certified Fitness Instructor, ACE Certified Lifestyle and Weight management, and NASN Licensed Sports Nutritionist. She has appeared in multiple infomercials, ExerciseTV features, and various news and fitness segments, is the author of "101 Ways to Workout with Weights" as well as two ultrafit cookbooks, and is a nutrition/fitness consultant to many athletes including San Diego Charger football players, San Diego Charger girls, and professional baseball players. For more information, visit her Web site.