Logging miles isn't the only way to prep for a long run or bike race. Gym class offerings can improve your cardiovascular and strength to increase your athletic performance.
Is a 20-Minute Workout Enough Exercise?
Why Strength Training Matters and How to Add It to Your Workout - The New York Times
Training cardio and weights during the same workout probably won't hurt your 'gains' – here's why
Half marathon training plans for every runner
Cross-Training: What It Is and How to Get Started
How to Train for Half Marathon
Fall Marathon Training Plan: How to Up the Miles and Find Your Pace - The New York Times
The Benefits of an Indoor Cycling Class, Muscles Worked & Tips
6 Track Workouts to Improve Your Speed
25 rules of successful marathon training
How to Make a Fitness Class Successful: 9 Key Tips