Your brain can't tell the difference between imagining a workout and actually doing one. Studies show people who visualized lifting weights gained as much strength as those who actually lifted them. The same happened with piano players who only imagined practicing.
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The brain doesn't know the difference between a thought and reality. They had people who they said, you guys are gonna go lift these weights for X amount of minutes a day for X amount of weeks. You guys are going to come and sit in a room and think about lifting the weights. So they measured everyone's strength in the beginning, and then however many weeks later, they came back in and they measured everyone's strength again. And the people who came and just thought about lifting the weight had the same increase in strength as the people who actually lifted the weight. Same goes for a piano. They had people come in and take no piano lessons, and they had people come in and just think about playing the piano, learning how to play the piano, and listening to piano. At the end of 60 days, the people who thought about learning to play the piano and listen to piano had the same ability as the people who actually took piano lessons. So