Panshrmu--I am definitely not a expert when it comes to this kind of stuff but I would say form can definitely impact your knees. I have a knee problem and found I just had to slightly modify my movement and not go as hard. It really helped quite a bit!

I do not commit to the 30DS every single day. I try to add in other types of exercise throughout the week so that I don't burn out quickly. So walking is always good. Just make sure that you balance exercise to suit how you feel and how you can motivate yourself.

L2D2 ... 15 days on shred!

Wish I'd found this thread at the beginning of May, as I would have joined in. I have tried the 30 day shred before and found myself sore the days after a workout, so I thought it would be effective, but I didn't stay committed for 30 days. I'm going to watch this thread for now and see how you guys do and maybe try it again once I get back home from travels (which is where my videos are).

I didn't notice any knee strain or pain when I did this, but I only managed about 2 weeks last time. I do notice that when I'm heavier (the size I am now), my knees and ankles are a bit achy in general. I'd be interested to hear what others have to say about the knee issue, too -- is it bad form that causes knee pain or just carrying the extra weight and doing those kinds of exercises?

I'm on L1D2. I add in soccer and other activities so that I am not doing this everyday as I don't want to quit!

Neon-I did it only for 5 days a few months ago but studying just took up too much of my time. I feel like it's okay if you don't complete the 30 days in 30 days! The idea is just being active, so don't worry that you didn't stay committed--life gets in the way!
Also, I would say it is improper form and excess weight that causes the pain. It's stress on muscles/joints/tendons that that they have never (or seldom) experienced. Building up the muscles around the areas that experience pain is most important to maintain form and have a less chance of experiencing the pain.

Okay so I am on L1D3 going on to day 4. I might switch to level 2. I am hoping this will work for me!! I kind of want to start just a whole new thread about the 30DS but not have it within a month timeframe. Just to have everyone pop in and give their ideas about eh 30DS.

I'm only on day 4 and I already know everything Jillian is going to say on Level 1 so it's becoming VERYY annoying!!