https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13995149Edit 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 1043 px | 300 dpiLarge JPEG 2835 x 2464 px | 300 dpiFree DownloadMen and women performing various exercises using the system of opposing forces devised by J.L. Pichery. Wood engravings, 18--.More