I believe self esteem is about how confident one is with themselves and whether they are happy around people; if they have a low self esteem it means the person does not believe in themselves and sees themselves as not upto some sort of standard.
Dialysis patient demographics starting treatment
Yes, every exercise should include both of these. If you exercise without warming up you could easily pull a muscle or worse.
Hope this helped! (:
It's the white blood cells I think