Image imported from derpibooru
Original Description:

Rarity: FWEEET! Okay Sweetie Belle, dahling, it’s time to train for the next Sisterhooves Social.
Sweetie Belle: You really can rock that tomboy look, Rarity.
A sort of sequel pic done for me by Jennieoo to Tomboy Rarity shown here: https://derpibooru.org/images/3284212 After that disastrous spa date with Rainbow Dash, Rarity decided to keep the whistle she had on for the tomboy look and put it to good use, in drilling her sister on the upcoming Sisterhooves Social. The Rarity sisters are planning to get the trophy this time, but it’ll take several hours of hard work to beat Rainbow Dash and Scootaloo, who are also competing.