See one reason I'd be scared of Mel as my personal trainer... Look at her list... Ok not really
I can't say the best because well the best is to challenge your muscles with different exercises but I'll say what I like
Shoulders- I like overhead presses but I like to do them seated.
Biceps - hammer curls.
Triceps - bent over tricep kick backs
Chest - dumbbell flys lying on a bench
Back- assisted pullups (one day I hope to do unassisted pullups but I need to lose weight and increase strength before that day comes)
Abs - Planks!
Obliques - twisting crunches
Lower Abs - reverse crunches
Butt - Lunges! Although I have a new favorite which I got from my Push DVD. It is a bridged kick up. Basically you do a bridge, then straigten one leg and kick up. My booty hurt for 2 days due to that one.
Quadriceps - I have to say I have always loved the overhead lying leg press where you push weight up while you are lying down.
Hamstrings - I like dead lifts, I may have to try them with one leg now and see what happens.
Calves - donkey raises