When was the last time you tried to do a side plank?

Well, for Barely Famous Star Erin Foster The answer isn’t until Thursday April 22nd when she posted proof of her Instagram story with the playful headline, “Have you ever stood on the side with your 37-year-old stepmother? I did”.

In the photo in her Instagram story, the actress can be seen next to both stepmothers during training Katharine McPhee and sister Jordan Foster, who both shared their side of the story on the gram.

For Jordan, it was a sincere take on how her family served as her support system. “I was really struggling to get the body back after baby # 2, so I decided to force other people to exercise with me to make it easier,” wrote Jordan.

Will you ask us next time? Because the joke among the Foster crew is the stuff of comedic gold.