I've found that trainers or other experienced body builders are great to work out with because they can help with form and method. One of the biggest issues I have is muscle isolation, meaning that while trying to workout a certain muscle group, I actually work out another.
Example: Tricep dips, I end up extending out too far and end up working my shoulders instead of my triceps. I realized this after watching training videos. But I never felt like it was working my shoulders so I never thought about it.
My question is, how can a person who is training alone help to realize when they are not isolating the target muscle group and prevent doing so?
Watching videos is a great way to get the form right but since no one is there watching me, what can I do to make sure my form is correct and that I'm isolating the target muscle group?