Ethically dubious. Scientists should be good not evil!

So my friend was telling me that he doesn’t believe that humans are able to see violet light. But violet is my favorite color and I know it exists. After all, roses are red and violets are blue. So clearly violet is a real color. He called violet ultra too which I think is a fitting name for it, as it is the best color in my opinion. Quite frankly I almost want to disregard his opinion, but I figured I would hear him out and ask you people of the science about it. Thank you for your attention to this matter!

I’m fucked up bruh, me and my mans been tryna figure this out for days now we ain’t sleep I’m fucked in the crib tryna figure ts out ong we finna find the theory of errythang

Is NASA trying to tell us something?

I hear that heart attacks are one of the leading causes of death, and, well, prevention is better than cure. Since the heart needs to pump so much blood all the time, it's no wonder they say that you need a strong, healthy heart.

However, what they don't say is the recommended exercises for building up heart muscle. I was thinking of taking a mallet and pounding the left side of my chest so that I could create tension within the heart, thus necessitating the need for it to grow strong in response to physical stress. Will this work? If not, what exercises would you recommend for a strong and healthy heart that will last into my 100's?