If your cat eats dry food, he's more prone to constipation than a cat who eats wet food due to the decreased moisture content. Your vet will do a simple test to determine your cat's hydration level by pinching a fold of skin on his shoulders and pulling up. If it snaps back into place when released, he's well hydrated.
Comparing the Calorie Burn. In terms of calories, a 30 minute treadmill running session at 6mph for an 155lb adult will burn around 350 calories. The same size adult will burn around 260 calories in 30 minutes on a Spin bike at a steady pace. However, a Spinning class is much more intense so you can expect to burn anywhere from 400-600 calories if you push yourself.
According to Everydayhealth.com, a cyclist burns about 5.5 calories per hour per pound of body weight riding between 16 and 20 mph. Riding between 12 and 14 mph burns about 3.6 calories per mile per pound. In other words, a 130-pound woman burns about 715 calories riding 17 miles in one hour. If she slows down to 13 mph, she burns only 468 calories per hour. If she goes mountain biking, which burns about 3.9 calories per pound per hour, she burns about 507 calories even though she may only cover eight miles.