Brother and sister Tom and Mia have big problems: they have to take over their parents' fitness studio, but the gym is on the brink of financial collapse. Another problem: the two never really wanted anything to do with the family business. However, the last will and testament of their deceased mother now leaves them no other choice. Mia and Tom are thrown into a world that is quite foreign to them and slowly but surely become part of a dysfunctional, chaotic but also extremely lovable fitness family.