There are a few straight physical cues men can hack effectively. It's also useful to know that, given the shape and exposure patterns of men's clothing, a woman is likely to notice the tone of your arms, shoulders, and chest first and most. This is important. Wash your hair and brush your teeth. Furthermore, use the stuff you've already got.
Muscle tone takes time.
But way more than half the geeks I know have beautiful long hair. Very few of them have figured out that greasy hair is disgusting. Watch your breath, also. If you can't brush, tasting like Certs or Altoids is much better than tasting as though you just ate a dead rodent. It's an instant chick magnet.