why should you bend your knees as you hit the ground after jumping from a roof?
142991
it  reduces the  impact stress on legs the whole thing is like ths if your legs are stiff and straight then all the impact gose to your legs and can mess them up but if legs are bent a bit then  there is a little give and
1182918
What they are doing is stretching the tendons when they strike you. Your body should have a natural tendancy to contract the tendon, therefore contracting the attached muscle. This produces the leg jerk you see if they are hitting your knee. If there is no leg jerk, there could be a problem with your nervous pathways, or with another area of your body. This test can be performed on various joints in the body, including the knee, elbow, and wrist.
55588
I don't quite understand your question, do you mean that you are scared that your elbow is going to hit your hips? But I'll give an answer anyways, it may help or not, but Try keeping your elbow straight, you should never bend your elbow when you are in your swing.
229420
like they said earlier, bend your knees a heck of a lot. but, you will need to hit the ball in front of your body because if you hit it close, you are going to mis-hit it or flail it long. try setting up two wooden poles along the sides of the net and then set a string about 2-3 feet above the net connected to the poles. get a ball machine or have somebody feed you a lot of balls and just practice hitting it through that "window" that it creates and adjust as necessary. if you are hitting the ball over the string every time, aim lower and don't go low to high on your swing as much. if you are hitting the ball in the net, check the angle of your racket face when you hit and bend your knees more to get below the ball. if you are hitting them long, come over the ball a bit more to get more topspin or just don't hit the ball so hard. all it takes is a hitting of a lot of tennis balls and after you finally find your comfort zone in hitting low, hard balls over the net, you will be one heck of a good tennis player.\n\np.s. hitting the ball low and hard over the net is not advised. it is a very high-risk shot. however it might have a great feel to it and you will have awesome winners, unless you are really good at it, it will probably not win you many matches with tough players that can get it back. but it is always fun to hit and is a great approach shot for coming in and taking volleys.
1126770
Squats, not lunges, is the exercise most closely mimiced by a leg press machine.  The most important muscle, the one that helps you get airborne, are the gluteals.\n\nSpread your feet a little wider than your shoulders (a little less than 2 feet).  Bend your knees slightly.  Lower yourself by sticking your butt back, as if you were blind and trying to find a chair behind you.  Weight is on your heels.  Your arms can act as a counterweight, if you hold them straight in front of you.\n\nFor more explosiveness, try mixing in some leap squats, where you get airborne coming out of each squat.\n\nGood luck!
320122
hurdler's stretch.  you sit with one foot tucked in behind you so that your knee points away at a right angle to your other leg which is stretched out in front of you.  slowly stretch out so that you touch the toes of your outstretched leg (go as low as you can bear), hold it for a few seconds then release.  don't over do it, and don't bounce - you'll pull something.
199287
Also, move your knees from side to side. It releases a trapped nerve if it's siatica.
384816
Or just keep your knee ahead of your foot until you follow through striking the ball. This helps ensure that your toe is in the correct position.
993508
Its scared of getting knocked around between your knees!!! Dont listen to those other guys...I am correct!!!
1067488
First make sure that you can go back into a back bend before you actually kick over. If you can do that, then do a backbend kickover, the same thing as a back walkover but you stop in your back bend before you kick over. It's okay if you don't make it the first few times. You're not going to be perfect at it the first time. Gradually make yourself kick over faster. Make sure you keep your legs straight though or it will look ugly. lol. Good luck!
421227
The child needs to try it out.  When the pedal is at its lowest point, the child's leg should be slightly bent.  You don't want the legs to be perfect straight because that will cause the knees to lock up and create sore muscles.
574835
my knees pop every time i bend down
545262
Im thinking the question is " Why do they roll around on the ground after being hit". I think you would roll around on the ground after being hit by something that is going at times 96 miles per hour...It hurts!
347023
If you jump, you will be moving at the same speed as the vehicle just before you left the floor.\n\nWhen in the air, if the vehicle is accelerating, the vehicle will move forward faster than you and consequently, you will land some distance from where you jumped and vice versa.\n\nIf on the other hand, the vehicle was not accelerating, you will land at the exact place you jumped from. Of course, this is not counting air resistance.
280325
This refers to the part of your foot that touches down first.\n\nIf you land first on your heel, it is harder on your joints.\n\nIf you land first on the ball of your foot, your muscles absorb some of the shock before your heel hits.
376543
when u run ur feet must land on the ground  at the balls of your feet and the toes.landing on ur heel causes injuries(serious ones).also avoid running on tarred roads(asphalt).they are bad for ur knees.And before u start running do a few excercises (streching)etc to heat up your body and also to improve circulation.if u start runnin (especially in the morning) without proper streching it will hurt u(physically)
921218
Flippin ages!  I was knocked down by a car 4 weeks ago and although nothing was broken, I cannot kneel, or fully bend my leg yet.  It is a complicated joint the knee with lots of room for swelling and pockets of fluid.  Keep off it as much as poss and let mother nature do what she does best...in her own time.