Dear Father Christmas,
This year Mummy & Daddy [delete/amend as appropriate] have been very encouraging to me and I would like to repay that.
Please could you arrange that on Christmas morning I can go to parkrun? it's at the usual time as you would know (0900). I will forego opening some or all of my presents until afterwards. I just want the adults in my life to ensure that they get some exercise on Christmas Day.
Oh, and before I forget please could you also sort it that they take me to the New Year's Day parkrun. I've heard that adults tend to stay up the night before and sometimes have a headache afterwards - so it would be a really good way to start 2019 with a parkrun. In fact Santa, as that nice parkrun at Eastleigh is being forgiving the year and running at 1030 could I please go to another at 0900 too - you see I can run 2 on New Year's Day, that's allowed.
I've worked it out that this all means I can run 6 times in 14 days (22/12, 25/12, 29/12, 1/1 x2 & 5/1) and I would really like it if Mummy & Daddy [delete/amend as appropriate] did so too. I'm sure it would do them a world of good and stop them paying for that ridiculous gym membership in the New Year, when as we know all they need to do is pull on some shoes and walk or run with me around a lovely park.
P.S. as the run on 22/12 is always a Fancy Dress run this year I've decided to dress up as [insert detail] I'm hoping that Mummy & Daddy [delete/amend as appropriate] will join in this year and not be such humbugs.