Gift Certificate for a Birthday Party at Exxcel Gymnastics and Climbing. Exxcel offers parties for up to 20 children (ages 3 and up) or rock climbing parties for up to 15 children (ages 7 and up). Enjoy one hour of supervised activities in Exxcel's gym and continue the fun in a festively decorated party room for one half hour. Party invitations and a t-shirt for the birthday child are included.