To leave DCs home alone while I go for a run?

[Borntorun25]

I'm a long term lurker and have gleaned much good advice and also amusement from Mumsnet, but this is my first post. I suspect I am BU but would appreciate objective opinions please.
2 DCs, aged 11 and 9. Off school for 5 days hols (schools, not mine!). DC currently away from home for work.
I love running, have been doing for 8 years now and has majorly helped both physical and mental health. I get seriously twitchy if I miss.
I am self employed and arrange my hours so I can usually fit a run in during school time. If not possible I get up early before DH goes to work. Neither option possible currently.
DCs do sometimes run with me but neither want to today. We spent most of yesterday on beach and they just want to chill and play minecraft, etc on iPads today. We are going out this afternoon anyway so they will get fresh air then.
I would be gone for 40 mins. Have never left them this long before. Have only ever driven to nearest shop for paper/milk, max of 15-20 mins alone before. They would happily play on iPads for hours if left to own devices.
I suspect IABU, it's just such a lovely day here and the road looks sooo inviting.......
They are too young really, aren't they? Happy to be told so, then I will settle myself down!

I think if they are sensible and then fine, I know with my dd once the telly is on she literally will not move!!

Once my dd goes to secondary she will be getting herself to and from school and having to entertain herself until I get home from work

However I did once call round on one of dds friends to drop off a bday present and was really shocked to find they had been left on their own. They were 4 and 7yo Their dad had gone to asda and even though they had been told not to open the door to anyone they did to me.

I don't think YWBU weegie, purely for the fact that it wasn't your MIL's decision to take.

I'm sure it was just bad timing that you got a roasted arse