Gridine is a popular sport in the US that begins with the letter 'G.' Gridine is also known as American Football but, hey it still starts with a 'g' doesn't it??
an Olympic sport starting with m is marathon
A song starting with the letter G is Van Morrison's 'Gloria!'.
A thing starting with G is garage.
An antelope starting with G is gazelle.
A musical instrument starting with the letter g is a guitar.
A place starting with G is Great Britain.
i highly doubt it
Tennis
jogging
Ice Hockey
A beverage starting with the letter "g" can be Gatorade... or if you found another answer, then great.