my challenge by sending me a marathon race pack which you can buy here.. high 5 sports nutrition marathon race pack mix , and it makes a big difference. i had 3 gels during my run, an energy drink before i started, and at the end of my run i still had plenty of fuel in the tank, even after doing my longest run in a year and a massive improvement on last week's minutes per mile.
it's important to have used a gel on training runs, before the actual race as you don't want to try anything new on the day if you can help it. i had one before 