Just ran the Belfast marathon, which was my second. My training was good (for my standards) and was ready for a PB of less than 4 hours. Did a 01:45 half about a month ago. I have been dealing with a foot injury during taper but felt good just before race day.
Marathon didn't go well. Started fine but struggled after approx. 30 km. Ended up finishing at 4:30 having walked about 10km.
I believe the reason was my in-race fueling. Read somewhere that high carb intake is required and starting eating gels after 20 minutes. After the 4th gel at 01:20, I was heavy and starting slowing down. After a while, started experiencing pain at (I believe) my kidneys and really struggled to a point that I could not run. Finished the race but the pain persisted for the rest of the day, hurting almost in every breath and more so when laughing, taking deep breaths etc.
Rookie mistake and I should know better but now don't want to waste my training so thinking of adding another marathon in the next month.
Is this too soon? Any training strategy recommendations? Any thoughts would be appreciated?