These are easy to do and produce great results.

Retrieved from: http://www.sunkist.com/healthy/fitness.aspx

Exercise

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  • Stand with your body facing a wall, about 2 feet away.
  • Place your hands shoulder-width apart on the wall.
  • Bending only at the elbows, lower your body toward the wall.
  • Keep your body firm throughout the exercise.
  • Push your body back to the starting position.
  • Repeat 8-10 times, rest for three minutes, and continue for two more sets.

Want to amp it up?  Do the set using only one arm, then switch arms.

Picture from: http://www.womenshealthmag.com/fitness/pushup-start-with-wall-pushup