Juuuust Beet it

Beetroot as a sports supplement??
Yes!

One beetroot (82g):
Carbs: 6.9g
Protein: 1.6g
Fibre: 2.9g

Beetroot also contains Nitrates.
Nitrates get converted to NITRIC OXIDE.
Nitric oxide opens our blood vessels which allows more blood and oxygen to be delivered to our muscles during exercise.
So. . . .beetroot = nitrates = nitric oxide = happier muscles = potential improvement in performance
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You will need around 500ml of straight beetroot juice to get the desired concentration of nitrates OR companies like Beet It Sport offer a 70ml shot that offer similar amount of Nitrates.

NB: watch for purple pee or poo or stomach upset