A hot tub, a yoga class and a piece of cake... In this eighth book in The Grandpa Mudcake Series, Grandpa Mudcake visits a new gym that's opened near his house. Grandpa decides to test the gym for one week, trying a different activity each day. - Which gym classes, if any, will Grandpa enjoy? - What type of exercise is Grandpa good at? - Will gym instructors, Gary and Janice, persuade Grandpa to join...