Quote Originally Posted by Jamoie
Arg, you said the word tone. OK here we go.
Firstly, you cannot "tone" a muscle. The muscle either shrinks, or it grows. Nothing else can happen to it, at all. Shape is determined by genetics and size is determined by outside factors.
So, you want your chest to look bigger? STAY AWAY FROM THE PEC DECK. Its an unnatural movement for a start, and a bench press is all you need to do. Maybe some Dips to supplement, an awesome exercise.
Anyways, for size, try and do a weight that will keep you to a rep/set range of 3 sets of 8 reps. Any higher than 12 reps and your going for muscular endurance, any lower and your going for strength.

So say, go to the gym
Do 3x8 Bench press (and make sure its not the machine, the actual free weights will be a lot better)
Then 3x8 dips (depending how many you can do)
Good chest workout there.

Eat lots of protein and carbs to go with your cardio and you will see results.
Thanks for the info buddy