RE: Budding push-up mavens
I have a love/hate relationship with push-ups - I hate 'em because they're so hard, but I love 'em because they really do work several muscle groups.
It's important to note that push-ups are not just a pec exercise - your front shoulder muscles (anterior deltoids) and triceps muscles (at the back of your upper arm) are also being recruited. Thus it's important to pay attention to STRENGTHENING (not just "toning", a term I really, really despise) these groups. Further, your core muscles are being recruited to keep your back flat (a la planks), and your quadriceps are being recruited to keep your legs from flopping out if you're doing them in a straight-leg position.
If you make push-ups a part of each and every workout, and pay attention to trying to increase your reps just by one each week or two, you can build up. When I first started doing push-ups back in the mid-'90's, I was lucky if I could do 12 push-ups off the knees without dying. Now, I'm able to do drop sets of straight leg push-ups with my legs on platforms of varying heights, starting with my first set of 40-45 and going down to 20, 15, 12, and 12 per workout bout, with another 20 thrown in after my pec flyes and bench presses are done. And I can belt off 20 push-ups fast with my toes on the floor without losing my breath. Just be incremental in your rep increases and you'll do okay. Push-ups are worth the effort.
Annette Q. Aquajock