My child is smaller than the average 8 year old, will they still be able to do everything?

Although the age range for this week is 8-12 years of age we do teach all the activities to younger children on other courses. We have very small wetsuits, the smallest sails for windsurfing are tiny and if they are too small for wake boarding they will still join in and maybe use a ringo. They will be fully included. We start the activity week from age 8 not because of size but because it is a full on week and they will need to concentrate and keep going! We have found that to be the best age to start from.