https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13988862Edit ImageSaveSaveEditCropCustom TextMen and women performing various exercises using the system of opposing forces devised by J.L. Pichery. Wood engravings, 18--.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 932 px | 300 dpiLarge JPEG 3079 x 2391 px | 300 dpiFree DownloadMen and women performing various exercises using the system of opposing forces devised by J.L. Pichery. Wood engravings, 18--.More