Anna Janssen Golieva, 30, from Ukraine, completes a set of squats while her son Sasha, foreground, waits, on Tuesday, Nov. 2, 2021, in Aarhus, Denmark. The crossfit class, Stærkt Selskab, includes only moms and their newborns. Around the room, many other babies are sleeping in strollers, on their own yoga mats or being comforted by the coaches.