You change your habits by simple things like
In order to increase our daily happiness we simply
in order to low your stress, to reduce your amount of cortisol or to loose weight you just need to
the good news is that you
the benefits are compounded
when you walk outside
walk 30 minutes per day
need to adopt habits which create natural happiness hormones
don't have to contract a personal trainer, which is very expensive.
giving up just one junk food a week, while replacing it with some fruits.