How do you prevent yourself from delaying your exercise and sleeping in instead?

I remind myself of the purpose of exercising and how it will benefit me. Them I will gain motivation to start exercising

I have a child going into teenage stage & notice him noticing more of my actions. I want to set a better example, & am aware that I can’t expect for him to listen to my words, if I do opposites. As time goes by I notice every small step I take makes it easier for further action & self esteem! Continuous Baby steps.. & awareness that there ISNT ALWAYS opportunity for another day.