Check out these fitness images:

181013 EKFL meistrikad-060
fitness
Image by siim.kinnas

A natural method of physical training : being a practical description of the “Checkley system” of physiculture / c by Edwin Checkley (1890)
fitness
Image by CircaSassy
This image is in the PUBLIC DOMAIN. Attribution is not necessary. The original book is available at the Internet Archive

www.archive.org/details/naturalmethodofp00chec

181013 EKFL meistrikad-1402
fitness
Image by siim.kinnas