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Actually, Marvin should take up Gymnastics. I've never taken Gymnastics but if it will help his balance, get Marvin some ballerina shoes and a balance beam and let him practice with girls scouts who never fall.
I actually started tumbling during my 10th grade year to get into good shape before baseball and it worked. It doesn't help your balance as much as your body control and Marvin would probably lose 10-15 pounds but gain more strenth.