Saying words to overcome sadness and learning positive things from a person who practices shirk

Q:

1. I learnt a technique to help with sadness, this is how the technique works, you say a positive word very slowly, with intention this word will have a positive effect, is this permissible or its kufr?

2. Someone who practices shirk and kufr philosophy, would it be permissible to learn from him positive things that doesn’t have shirk and kufr? 

Management charging an employee a fee for errors committed and distributing it in charity

Q: Is the following condition permissible ?

Contribution of R50 by the employee to a charity for any errors/mistakes at management’s discretion. "The Company" will be the representative of the employee and will handle any relating contributions.

DECLARATION:

I ______________________________, approve "The Company" as my representative to contribute R50 to a charity of their choice from my wage/salary for any errors/mistakes committed.

Yoga

Q: IS YOGA PERMISSIBLE AS PHYSICAL EXERCISE?

I've been diagnosed with ovarian failure and it's been difficult for me to get periods. I was prescribed to do yoga, and have got periods by doing them before too. But there's been many contradictions regarding yoga. I've tried normal exercises instead of yoga but didn't get any results, except for weight loss.

Would it be permissible for me to practise yoga poses without doing anything against the Islamic aqeedah? I take special care to ensure I don't do any doubtful poses like sun salutation (I just ended up doing it onetime without knowledge, that too I didn't complete it properly because it looked doubtful) and all. I also avoid taking it as anything except for prolonged physical movement.

Training to be a boxer

Q: We are aware that boxing and hitting the face or head isn't allowed. In some places, training is undertaken with headgear and other protection, this happens under the supervision of trained professionals. This is only for training and not on a professional level.

Is this permissible?

Prospective couple meeting and not delaying the marriage

Q:

1.When can a proposal be rejected in Islam?

2.Is it correct to ask for a prospective spouse who has a sunnah beard and sunnah dressing? I don't like a modern lifestyle because it's not what I am accustomed to nor brought up with.

3. How many times can a prospective couple meet under supervision if they need to discuss aspects of nikaah?

4. After the proposal a bride accepts, within how many days does one have to make nikaah... since it is emphasized in Hadith to hasten for nikkah to take place.