Abdominal muscles hurt

Newish bike (xc 16" frame), me 5'8" 11 stone with a paunch.
I'm not the healthiest having smoked for 16 yrs with little / no exercise. Been leisure riding for ladt 2 1/2 yrs mainly in Summer months.
Did a 31 mile ride yesterday which fncked me, legs were on fire. I expected some pain but today my abs are killing me! Bike is a typical xc set up and my seat was angled slightly forward.
What are the mechanics of my abs hurting and could It be down to the set up of the bike?... Or do I just need to toughen up?
Thanks.
I'm not the healthiest having smoked for 16 yrs with little / no exercise. Been leisure riding for ladt 2 1/2 yrs mainly in Summer months.
Did a 31 mile ride yesterday which fncked me, legs were on fire. I expected some pain but today my abs are killing me! Bike is a typical xc set up and my seat was angled slightly forward.
What are the mechanics of my abs hurting and could It be down to the set up of the bike?... Or do I just need to toughen up?

Thanks.
0
Posts
Struggling to see how sitting would out much strain on the abs.
Still trying to tweak the set up as its new and seat was angled forward if this could contribute? Had the forks locked out too for over half of it if this could have an effect?
As you may have noted from other posts, my tyre pressures wouldn't have done much for comfort (38/40 psi) either.
Could be down to the setup. If you know someone with a lot of expereince, get them to take a look at your setup.
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
Seat has been levelled since last ride & this photo was taken.