My sister and I workout together everyday at her house.  She has the perfect set up in her finished basement.  We take turns using her cardio equipment and then we spend time doing strength exercises.  My weakest area has been my triceps, and she has great looking arms and has no clue how to help me better tone mine.  So I went online to look for the best tricep workouts.  I found this site that gave me a whole routine that helped me quickly develop those muscles.  Within a couple of months my arms looked amazing.  In fact, better than my sisters.