I never understood why matter curves spacetime...until now!

Click this link https://boot.dev/?promo=FLOATHEADPHYSICS and use my code FLOATHEADPHYSICS to get 25% off your first payment for boot.dev. Link to buy the 'I don't give a flux T-shirt' https://floatheadphysics.com/products/i-dont-give-a-flux Why do we think matter curves spacetime. How can we intuitively arrive at that conclusion ourselves? The full sky dive video. (Disclaimer: It's about 8 years old and full of my cringe expressions!) https://www.youtube.com/watch?v=DvhN-Ey36I8 This video was sponsored by boot.dev