The fellow above, Albert Azaryan was a Armenian gymnast who competed internationally for the Soviet Union. Azaryan is the 1956 and 1960 Olympic Champion on the still rings and the first ever gymnast to become an Olympic Champion in Rings twice. Azaryan actually originated a variation of the Iron Cross which was eventually named for him, which incorporates a very difficult quarter turn to the side, a simply mind boggling display of shoulder strength.
In 1925, Cadine performed a one-arm swing with 90 kilos which was actually greater than his own bodyweight. Cadine could also right hand snatch 211 pounds and one-hand deadlifted the famous Apollon Wheels.
Also of note is the sand-pit floor — you’ll see this feature a lot in old school physical culture gyms as it made it so globe barbells and dumbbells were not damaged if they were ever dropped.