Proper Push-ups

Pushups 
Starting Position
Start with hands shoulder width apart on the floor and up on your toes, so that your body is supported, keeping your body as straight as possible. 

Action
EXHALE: Bend your elbows and lower chest to 90 degrees at the elbows. INHALE: Push up so that your arms are straight, making sure your elbows aren't completely locked. Try doing 2 sets of 10-12 repetitions. 
Special Instructions
Don't lock elbows out completely. Look straight ahead and keep spine in a neutral position. 
Muscles Worked: Chest, Triceps, Shoulders 
Time Involved: 2-3 minutes 
Body Benefit: A stronger chest and more defined arms 

~sparklepeople

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Try adding an exercise ball under your knee's/thigh area and do 15 push-ups...then hold a plank for 30-60secs., rest and do 2 more times.  I'm working on the ball under my toes...talk about using your core!!!