What are some body language mistakes that every salesperson should avoid, in your opinion? And why?

•  Clasping and rubbing hands together
• Dressing messy
• Arm crossing
• Eye rolling

thank you miss ghada i agree with all experts opinions. 

• Don't touch their faces it's a sign of distress.
• Doesn't align their shoulders in the right position.
• Don't Scratch their heads.
• Don't cross hands or fold arms.
• Keep the personal Space.
• Don't use the phone too much it's a sign of disrespect or lose of attention.
• Bad eye contact.
• Bad facial expressions.

i agree with  mr.vinod sir

don't lean too much and don't use your facial expression for bad shapes

Here it is to avoid:

15 Body language blunders to watch out for:

1. Leaning Back too much — you come off lazy or arrogant.
2. Leaning forward — can seem aggressive. Aim for a neutral posture.
3. Breaking eye contact too soon — can make you seem untrustworthy or overly nervous. Hold eye contact a hair longer, especially during a handshake.
4. Nodding too much — can make you look like a bobble head doll! Even if you agree with what’s being said, nod once and then try to remain still.
5. Chopping or pointing with your hands — feels aggressive.
6. Crossing your arms — makes you look defensive, especially when you’re answering questions. Try to keep your arms at your sides.
7. Fidgeting — instantly telegraphs how nervous you are. Avoid it at all costs.
8. Holding your hands behind your back (or firmly in your pockets) — can look rigid and stiff. Aim for a natural, hands at your sides posture.
9. Looking up or looking around — is a natural cue that someone is lying or not being themselves. Try to hold steady eye contact.
10. Staring — can be interpreted as aggressive. There’s a fine line between holding someone’s gaze and staring them down.
11. Failing to smile — can make people uncomfortable, and wonder if you really want to be there. Go for a genuine smile especially when meeting someone for the first time.
12. Stepping back when you’re asking for a decision — conveys fear or uncertainty. Stand your ground, or even take a slight step forward with conviction.
13. Steepling your fingers or holding palms up — looks like a begging position and conveys weakness.
14. Standing with hands on hips — is an aggressive posture, like a bird or a dog puffing themselves up to look bigger.
15. Checking your phone or watch — says you want to be somewhere else. Plus, it’s just bad manners.

Successful sales person will make sure of these;

1.dont forget to qualify your customers, dont waste time on not interested ones

2.Don't be a yes man

3.Don't offer too much of information

4.Don't oversell

5.Don't loose sight of the goal

6.Don't delay the sales

7.Don't talk past the sell

You don’t have to be a good sales person to close a deal. You just have to avoid the mistakes I talked about above. If you can do that, you’ll start closing more deals and make more money.

touch face

nervase and not seat

or seat with high relax

deffence action by his body during meeting