http://www.chekinstitute.com Paul Chek shares one of his favorite mini-circuits coupling deadlifts, cross-lateral Olympic barbell rows, and reptilian crawling exercises. He shares the importance of high tension (intensity) exercise for maintaining muscle mass once you get past your mid-40s. To learn much more about how to lift weights safely and effectively, feel free to visit http://www.chekinstitute.com and order his "Gym Instructor" DVD series; go to "Shop" then "DVDs". He covers most all common gym lifts, core conditioning, Swiss ball use, and much more! Remember, "what you don't know about weight lifting CAN hurt you!
Enjoy!