No, any light weight. 1-2 lbs. It's just being used as something to pick-up. You can use anything as long as it's the height of the bosu. You don't want to have to bend down further than your feet.
The aim of the exercise is balance not strength.
I wanted to put in my $.02 about Bosus. I'm a fitness trainer and it makes me cringe, seeing how people use these things. I think they have a time and place; for instance, during injury recovery or physical therapy, they can be great. But for fit people who are trying to increase their strength, they are pretty worthless. As a matter of fact, they can be detrimental to strength gains because you can't use heavy enough weights if you're on an unstable surface. If you can't push the limits, you won't get stronger.
I see a lot of other trainers putting people (beginners, even!) on balls and Bosus and it is just asking for an injury. If you're new to working out, combining an unstable surface with resistance training is incredibly dangerous. The only people who should be doing that are people with a lot of experience, and those people get nothing out of a Bosu workout, so why bother?
I really think Bosus are just a fad and don't have many real benefits for the average, fit person. So save your $$!
Missed this before I made my last post. I 100% agree with this statement. I gain so much more from lifting heavy weights than I do from "unstable" work. Squats, cleans, push-ups, presses, dips, plyometrics. Not a huge fan of the Bosu ball and Swiss ball for weight training.
altagirl - I think that gains made with free weights are definitely functional. The problem with instability training is that you don't gain strength at all. You can improve your balance, but you're not really "training" your muscles, and in fact you can't apply as much resistance so you'd lose strength if that's all you did. The problem with instability training is that you're not really making any gains. You're practicing balance, which is great, but you will not actually make gains that way.
Assuming that you're training all your muscle groups equally, you aren't any more prone to injury if you've been lifting for strength. Building muscle with proper form makes you less prone to injury. I suppose if you don't do anything at all besides using only the nautilus machines for years, that might not be true, but hardly anyone would fall into that category.
altagirl - I think that gains made with free weights are definitely functional. The problem with instability training is that you don't gain strength at all. You can improve your balance, but you're not really "training" your muscles, and in fact you can't apply as much resistance so you'd lose strength if that's all you did. The problem with instability training is that you're not really making any gains. You're practicing balance, which is great, but you will not actually make gains that way.
Assuming that you're training all your muscle groups equally, you aren't any more prone to injury if you've been lifting for strength. Building muscle with proper form makes you less prone to injury. I suppose if you don't do anything at all besides using only the nautilus machines for years, that might not be true, but hardly anyone would fall into that category.
I hadn't really thought about it before but both of my torn ACLs came after a period of about 8 months of pretty intense weight training (tons of hamstring work too, so it wasn't an imbalance that way)without much balance work. Really, each ACL tear came at the point where I would say I was by far the strongest I have ever been in my life. It could be coincidence, it just made me wonder.
Lisamarie will probably chime in on this.
I guess this comes to the question whether strength or balance is more important, or in what measure? Seems to me that we should do both.
Obviously, AG, your story is anecdotal; mine too: I'm not terribly strong (stronger than I look, but still...), but I have "incredible" balance (told to me by a trainer who works with US Cycling athletes). I have to be very careful with my knees because of wear and tear issues, but I've never done an ACL. Never even close. And for a girl who played years of competitive soccer AND has skied as long as I have, I sometimes find this amazing. Both sports are ACL killers!
I can't do too much weight work with my legs because of the arthritis in my knees. I have to do a lot of Bosu activity, and non-extension-type lifting. Straight leg things, wall sits, etc. That just doesn't build a lot of bulk. Every once in a while I can do lunges, but usually I get the sharp kneecap pain.
Okay, I really don't like talking about it, because I don't want to jinx it. But just something to add to the mix. ...
I guess the other thing is - if all the muscle I had back at that point wasn't protecting me from knee injury... uh. What the heck do I need to do?
What was the mechanism of your injury?
Why do all the top skiers use them then? I'm confused!