Check out these fitness images:
181013 EKFL meistrikad-060
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)
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
Image by siim.kinnas