However , there are energy gels such as Gu or Power Gel that contain 100 calories per serving and can be taken during a run to replace much needed glycogen .
While sport drinks provide some of this glycogen , they typically do not provide adequate amounts .
There are energy gels such as Gu or Power Gel that contain 100 calories per serving and can be taken during a run to replace much needed glycogen .
While sport drinks provide some of this glycogen , they typically do not provide adequate amounts .