The Sister Switch — Jane B. Mason; Sarah Hines Stephens

Sporty Andie and musical Caitlin are identical twins who couldn't be less alike. They're psyched to live their own lives in junior high, but when a fitness test threatens to ruin Caitlin's year, being mistaken for each other might just save the day. It's supposed to be a one-time thing, but stopping turns out to be harder than they thought! Can they straighten things out before their sister switching ruins everything?