It appears there might be a misunderstanding. Sitting down was not "invented" in 1928. People have been sitting down for as long as humans have existed. Throughout history, humans have used various forms of seating, such as benches, stools, rocks, logs, and the ground, to rest and relax.
The reference to 1928 might pertain to a specific invention or innovation related to seating, but it does not mean that sitting itself was only introduced at that time. It's important to note that sitting is a natural and fundamental human posture that has been used throughout human history for various activities, including rest, conversation, work, and leisure.