Gels are expensive, and when you are training for a full or half marathon the price adds up, not mention that many gels give runners stomach issues- this DIY homemade Portable running fuel for runners is a great Runner Hack, each packet is only pennies, a
Impossibly easy to make-DIY waterproof homemade race pace band- takes less than five minutes to make. Link to a template for both marathon, half marathon, and in miles or km. These are a must if you want to stay on pace during a race.
16-Week Half-Marathon Training Schedule For Beginners