The 5 points of yoga
The 5 points of yoga basically help essence of the yoga teachings into five principles for physical and mental health as well as spiritual growth. These are the core teachings to : proper exercise, proper breathing, proper relaxation, proper diet and positive thinking and meditation.
So to begin im going to explain to you what proper exercise is vs. what is not..

Proper breathing
Yoga teaches us how to use our lungs to thier maximum capacity and how to properly use out breath. Fact is most people only use about a fraction of our lung capacity. Due to bad posture our shoulders tend to not open thier ribcage which means they cannot reach thier full lung capacity.
Proper relaxing