A set of good quality 7mm sleeves can make a huge difference. Warmup as mentioned above is key and the sleeves will help your knees stay warm.
I usually do some ab work, slide on my knee sleeves and knock out a long set of leg extensions at a moderate weight. I believe Kel does some work on a bike prior to squats.
Squat to the extent your body allows, buy try to break parallel. If you have issues at a heavier weight, drop back to the weight you can handle and increase the number of reps or sets.
There are 3 loves in my life: my wife, my English mastiffs, and my weightlifting....Man, my wife gets really pissed when I get the 3 confused...
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