10km-race in Yokohama

Yesterday, Feb. 19, I participated in 10km-race held by FM Yokohama, a radio station.

I finished in 54 minutes, 11km per hour.

Full Marathon is a future target and I need more practices to run by 13km per hour.

I got t-shirt there.

"Voluntainer "

I saw the poster saying a new word "Voluntainer". It sounds good to me in the combination of "volunteer" with "entertainer", just like "applepen" by Pico Taro.

However, I was just wondering if a hyphen is needed after "N".  Otherwise, it's going to be two words.