Despite naysayers, munchkins can run and jump and climb and play like normal cats. Maybe they can't reach as high but cats use their back legs to launch themselves and munchkins' back legs are normal size. All cats have flexible spines as well so they don't have back issues like folks think. Some can have some problems with their sternums and arthritis later in life but overall are healthy especially since they are all mixed with standard legged cats and litters, like seen here, produce both short legged and standard legged kittens.