Fundamental Water Skills. 5 -10 yrs. 4 year-olds may participate if they have passed Level 1. Skills include: bobbing, floating unsupported, front/back glides, combined stroke unsupported. To Pass: enter chest deep water, front float, roll to back float, return to vertical; swim using combined front stroke, roll to back and float, return to front and continue swimming. NOTE: in most cases, it will take a child more than one session of lessons to pass the level.