So just started learning guitar and singed up for guitar tricks but im having a problem with the spider exercise on that my wrist is bending alot when trying to get my finger tips on the string and the more i try to stretch for other frets it seems to bend more, im also finding alot of tension on my wrist and im having to push my thumb into the back of the neck just to make the stretches,so my question, is this normal while building up strength on my fret hand or am i doing something completely wrong?

Just to add i do have small hands and shot fingers