Ever wondered why MX4 is so special? Not only are our instructors top notch but it’s also one of the few gyms to have both assult bikes and sleds! 🏋️‍♀️💥 Come train with us today for only $49 a month for members!! 📞 Non-members welcome! @mx4_brentwood #crossfit #assultbike #crossfitgirls #crossfitgames #weight #weightlifting #resistancetraining #sled #mx4life #fitness #boxing #boxingtraining #matrix #new #healthclub #bayarea #oakley #brentwood #discoverybay