11. Slow down a bit – this goes for many things. Walking slower not only makes you seem more calm and confident, it will also make you feel less stressed. If someone addresses you, don’t snap you’re neck in their direction, turn it a bit more slowly instead.
12. Don’t fidget – try to avoid, phase out or transform fidgety movement and nervous ticks such as shaking your leg or tapping your fingers against the table rapidly. You’ll seem nervous and fidgeting can be a distracting when you try to get something across. Declutter your movements if you are all over the place. Try to relax, slow down and focus your movements.
13. Use your hands more confidently – instead of fidgeting with your hands and scratching your face use them to communicate what you are trying to say. Use your hands to describe something or to add weight to a point you are trying to make. But don’t use them to much or it might become distracting. And don’t let your hands flail around, use them with some control.
14. Lower your drink – don’t hold your drink in front of your chest. In fact, don’t hold anything in front of your heart as it will make you seem guarded and distant. Lower it and hold it beside your leg instead.
15. Realise where you spine ends – many people (including me until recently) might sit or stand with a straight back in a good posture. However, they might think that the spine ends where the neck begins and therefore crane the neck forward in a Montgomery Burns-pose. Your spine ends in the back of your head. Keep you whole spine straight and aligned for better posture.
16. Don’t stand too close –one of the things we learned from Seinfeld is that everybody gets weirded out by a close-talker. Let people have their personal space, don’t invade it.
17. Mirror – Often when you get along with a person, when the two of you get a good connection, you will start to mirror each other unconsciously. That means that you mirror the other person’s body language a bit. To make the connection better you can try a bit of proactive mirroring. If he leans forward, you might lean forward. If she holds her hands on her thighs, you might do the same. But don’t react instantly and don’t mirror every change in body language. Then weirdness will ensue. 
18. Keep a good attitude – last but not least, keep a positive, open and relaxed attitude. How you feel will come through in your body language and can make a major difference. For information on how make yourself feel better read 10 ways to change how you feel and for relaxation try A very simple way to feel relaxed for 24 hours.
You can change your body language but as all new habits it takes a while. Especially things like keeping you head up might take time to correct if you have spent thousands of days looking at your feet. And if you try and change to many things at once it might become confusing and feel overwhelming.
Take a couple of these body language bits to work on every day for three to four weeks. By then they should have developed into new habits and something you’ll do without even thinking about it. If not, keep on until it sticks. Then take another couple of things you’d like to change and work on them.