Reciprocal inhibition is like a game of tug-of-war between two muscles in your body. Imagine that you have two muscles holding onto a rope, one on each side. When one muscle pulls on the rope, the other muscle has to let go and relax. Then, when the other muscle pulls on the rope, the first muscle has to let go and relax.
This happens in your body too, with different muscles. When one muscle contracts, or tightens up, it sends a message to another muscle to relax. This is called reciprocal inhibition. It's like a balancing act, where one muscle is always pushing and the other is always pulling.
So, when you want to move your arm, for example, your bicep muscle will contract and pull your arm up. But at the same time, your tricep muscle will relax and let your arm move. Then, when you want to lower your arm, your tricep muscle will contract and pull your arm down, while your bicep muscle relaxes and lets your arm move.
Reciprocal inhibition helps your muscles work together smoothly and efficiently, so you can move your body the way you want to.