We often discuss a lot of theory here, i.e., "improve your game". This is, admittedly, vague advice. RP new guys will say "great! I wanna improve my game!...but how?" Well, in addition to hitting the gym, improving your shitty wardrobe and hygiene habits, there is one step you can take with little physical effort, just some conscious awareness.
I'm going to focus on one way that is:
Improve your posture. Walk around like you are the shit. Are your hands in your pockets? Pull them out. Are your shoulders slouched forward? Pull them back. Are you passing someone on the street? Make eye contact with him/her. You aren't sure if she made "fuck me" eyes at you while you were walking towards the neighborhood Starbucks? Assume she did.
Keep your chin UP at all times. A man with his face in the ground all the time is a pussy, and women sense that shit. The world is lucky to have you, not the other way around. If you lock eyes with a woman, do NOT look away. Give her that shit-eating grin that makes her wonder what the hell you just did that's giving you that sort of confidence. She "feels" uncomfortable? Who gives a shit. She was lucky enough to experience you for a brief moment of her life. Her loss, not yours.
Like CH often says, "lead with your dick". Let it pull you around. Just by improving posture, you'll see how much the rest of you follows.