1) The more you stick to what we were designed for as animals — lifting rocks, carrying carcasses, and generally just fighting against gravity — then the better off you are. What that means is using free weights over machines. One problem with machines is the fixed pattern of movement. For that same reason, I think dumbbells are a better choice for most exercises than barbells, particularly if you’re dealing with an athletic population.
2) Want Great Abs? Then Do Your Squats!
Abdominal specialization for athletes? It could happen, but the abs actually have very little potential for strength increases when compared to other muscles like calves. Along with the grip, the abdominals are the least likely to improve with training. Some of these guys can claim all these poundage's used in ab training, but it’s actually the psoas doing the work. If you truly isolate the abs, after six to eight weeks an athlete will plateau the rest of his life. Research has shown that the most coordinated athletes master the most difficult abdominal exercises in six to eight weeks. The only things that increase abdominal improvement are squatting and deadlifting.
3) Chins: The Upper Body Squat
The chin-up and its variations should be considered an “upper body squat” because of its mass-building qualities and its ability to quickly increase functional strength. Chin-ups involve the sternal portion of the pectoralis major, latissimus dorsi, teres major, posterior deltoid, the rhomboids, the middle and lower portions of the trapezius, and the elbow flexors. A chin-up specialization program will not only build impressive width and thickness to your back, but will also pack solid inches on your arms by promoting growth on your biceps, brachialis, brachio-radialis, and pronator teres.