I can't understand why you're being encouraged to walk so soon after surgery, even by members of this forum.
From both surgeies, colon removal and J pouch creation, I was sent to High Dependancy Wards and I remained on an Operating Table type bed throughout, for at least 8 days and not once was I encouraged to walk, my bedding etc was changed around me, whilst I remained in bed.
Once I returned to the General Ward and in a Normal bed, it was at least another 10 days before I was encouraged to get out of bed and into a chair but I was too ill and weak, so I refused until I felt ready.
It got to the point where my Doctors were saying, rest don't do too much, you've had extensive and major surgery, just rest but the Auxiliary Nurses wanting me out of bed because it was beneficial for theirselves.
I only started to walk when I felt well and strong enough, which was at least, maybe 15 days after surgery.
Prior to my J pouch creation, I'd not had a flare up or been prescribed any medication to prevent a flare up for years, I was fit and well, no complications with the pouch during or after surgery and was still, not asked or encouraged to walk within a day or two after the surgery.