No one can ever say that Serena Williams and her husband, Reddit co-founder, Alexis Ohanian aren’t afraid to test their limits.

Over the weekend, the tennis champ and her husband completed their first Spartan race together, and from the look of their photos, it’s clear that they’re both two real tough cookies. 

The newlyweds bonded with a group of friends as they all ran and jumped in mud, flipped over obstacles, climbed ropes and pushed their strengths to the limit for the intense race required. 

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Both Williams and Ohanian shared photos on Instagram from their memorable experience and it definitely looks like they had fun. 

Spartans support Spartans.

A post shared by Alexis Ohanian Sr. (@alexisohanian) on

The couple tied the knot in November 2017 nearly a year after Ohanian popped the question and just two months after welcoming their adorable daughter, Alexis Olympia in September.