Hate to disagree with you, friend, but crunches are bad for your spine, neck and posture (I could give you more reasons not to do them).Originally Posted by Tobias92
About leg curls:Therefore, um, they are an isolation, not a compound exercise. Dead lifts, squats and leg raises will do the trick.Your hamstrings are built to work with your glutes to create movement. Seated or prone leg curl machines, however, ignore your glutes, which increases your risk of hamstring pulls and knee injuries. By isolating the hamstrings alone, they become tight and overactive over time.
About chin-ups:The elbows can take a beating from pull-ups and chin-ups, particularly when you start doing a lot of them, and especially when they’re performed improperly. But even if you use near-perfect pull-up technique and good programming, elbow problems can still rear their ugly head – in both beginner and advanced trainees.