Writing mathematical proofs has greatly improved my life
After 1-2 years of writing formal math proofs in undergraduate school, I now speak and write much more eloquently than I used to. Now, before uttering or writing a statement, I take a quick pause to ask myself whether
it's logically valid;
it's relevant and sequentially fluid, if it's in the context of other statements I've made;
it's concise, using the absolute fewest words possible.
I'm not exaggerating the least bit. And this why talking to women (which I rarely do) is so annoying: they use 5 times as many words as necessary, without logical coherence, relevance, or anything that makes a math proof "elegant."