The result is a seasonal strategy that allows whatever is going on at the time, primarily whether the market remains in rally mode or not, to influence the entries and exits, while maintaining the mechanical aspect that avoids usually wrong emotional input.
It maintains the mechanical aspects of Sell in May, avoiding emotional input, but incorporates a simple and well-known short-term technical indicator, MACD, to identify whether the market is still in correction mode when the entry date arrives in the fall, and whether it is still in rally mode when the calendar exit date arrives in the spring.
To fully emulate the human leg will involve motors, the mechanical equivalent of muscles, and electrical sensors that gather the same input as the human nervous system.