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Self improvement is not only about losing weight and muscle, its base meaning is to improve yourself through any means possible. Pick up a hobby, learn something, be healthier, perhaps even make someone else's life better to make the society you live in better. Doing these things almost always puts you in a better mood to handle when shit hits the fan and doesnt go as planned.
If you're just doing this shit for women, you're doing it for the wrong reasons, and even a braindead woman is gonna see through it and not care.