css925 said:
Usually my warm up consist of a few minutes on the treadmill walking to get the blood flowing. Then I do basic stretches, especially for the muscle group I am working that particular day. But not an extensive amount of stretching.
Unfortunately, that's not a very good way to begin a warm-up. You should try specific dynamic warm-ups, such as some of the exercises shown here:
They combine moving flexibility with more movement-specific activity. It's important to prepare the specific muscles for the activity, not just a "general" warm-up that will not improve coordination, neural drive (the ability of your Central Nervous System to activate the muscles) or specific blood flow (under exercise, while some blood vessels will be dilated, or opened, others will be constricted (closed), including all blood vessels that go to muscles not being used; therefore, light treadmill running will actually cause the opposite of your intentions to the muscles of the upper body.
Afterwards, you will want to perform
specific warm-ups for the exercise(s) that you will be performing. For instance, if you are preparing for a 5x5 squat with 250 pounds, your specific warm-up could look something like this:
1. 5 reps, 70% (140 lbs)
2. 3 reps, 80% (160 lbs)
3. 2 reps, 90% (180 lbs)
4. 1-2 reps, 100% (200 lbs)
Rest for 1-2 minutes, then begin your sets.