Though agility, power, and coordinating are all important skills, balance would be the one he should dedicate his attention to. This is because you need balance in order to ride a bicycle properly. This is unless you plan on professionally riding with training wheels.
I'm stuck between 1, 4 and 5.
1) Since it's water there is going to be waterborne diseases, but fixing the pollution in the town seems to be the best option
4.) Enforcing water laws can lower the chance of having waterborne diseases that might happen.
5) Related to #1, it'll help keep the sickness down if it was monitored and reported to local hospitals
1) lupus
2) cardiovascular disease
3) Huntington’s diseases
4) cancer
acupuncture and acupressure both go into farthing healing I believe