DonaldDownTheWing
Winger
Unless you doing marathons or longer, or triathlons etc then to me gels are pointless. Just hydrate and eat well. No need for gels when running up to HM.
Nutrition can be very different for lots of people. I know I couldn’t do a HM without any gels. I start to feel it around 13km and by the end I’m running in treacle. I know this as I ran a HM just taking in plain water to work out what worked best for me.
I do a gel at 7 & 14km, along with electrolytes in a bottle (I lose a lot of fluid during exercise) to stop my legs cramping.
As they base nutrition advice on body weight, heavier runners (like me at 95kg) need more than a racing snake.