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.
Most bikes work best with 95-115mm of sag when the rider is on the bike. Once you have the rider sag, check the static sag of the bike without the rider. Static Sag should range between 25-45mm. If the static sag is less than 25mm you need a stiffer spring and if it is greater than 45mm you need a softer spring.