Would there be any point in keeping an excercise diary to support my application? I'm running 25 miles a week, weightlifting and practicing bjj and boxing.
Some conditions require you to keep an exercise diary. It's not going to hurt to record what you are doing anyway, however IIRC they'll specify how long you need to keep a diary based on the condition you have/had/recorded.
It may halp reduce a referral period.