Swiss balls are relatively cheap and are the best for situps as they support the natural curvature of your spine during movement. Stabilization is also required so you don't fall off.
As for you not feeling any pain in you pecs after pushups, i'm not too sure sorry. All i can recommened is for you to continue doing pushups until you can't do any more. 3 sets.
The best way to attain definition is to lower your body fat percentage.
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