Do Not dip past 90-degrees, Do Not dip past the point where your upper
arm becomes parallel with the floor or don't dip so low that your shoulders go
below your elbow joint.
Do Not shrug your shoulders up during dips. Keep your shoulders down
while squeezing the muscles between your shoulder blades to maintain this
safer position. The video below shows the right & wrong ways to do this,
When doing chair dips it is very important you have strong sturdy chairs
that will not break or tip over while you are doing dips to prevent you from
getting injured.
You can put some weights in the
seats of the chairs or have 2 people sit on the chairs as you do dips to prevent
the chairs from moving.