The On Your Mark… emote is an Uncommon Fortnite emote. On Your Mark… was available via the Item Shop for 200 V-Bucks and you can buy it from Fortnite Item Shop when it will listed.
Fortnite On Your Mark… Skin Details
Don't forget to stretch.
Fortnite On Your Mark… Skin PNG Images
Here is the PNG images of On Your Mark... below!