Why do Soldier's wake up at 6 am, do push ups, sit ups, eat well, walk straight, ect?

The reason is to keep them in order, focused, determine, and most importantly shaping there mindset to be strong willed and trained.

This is done so rigorously so when you are out in the battle field and someone dies, it hurts badly to see this happen but they are mentally trained to handle stress and complete the mission because of mindset focus.

If this was not done previously, you could very well break down in the middle of war and freeze up.

You must be able to stay focused on your goal to be able to complete anything properly.

This applies to all of us in the same way. When we face adversity and set backs, to the point of it being very hard to cope with, if we do not have an understanding of where we need to continue to go and push forward, we will get stuck in that position, thought, feeling for possibly our whole life.

Have a plan, have goals, and define how you should carry yourself on a daily basis. Keep some standards and morals that you should have and execute them every single day!!

Some habits to consider are: Dressed proper, stay groomed, keep a high self esteem, read, exercise, eat healthy, have goals.
This will give you a positive feeling of confidence in your abilities that you will see and feel, as well as others will see this and you as a leader, which they will gravitate towards.