Do not rest your back knee on the ground.

Their back knee is on the ground, they've gone into a full groin opener.

Starting from a lunge, bring down the back knee.

He was uncomfortable putting weight on his back knee, making it hard to catch up to fastballs.

Trainer tip: When you lower into the lunge, don't let your back knee touch the floor.

Make it easier: Keep your back knee on the floor if you're wobbling around too much during the twist.

"That ball almost hit my back knee," Rodríguez said.

(Back knee supports less weight when his upper body is shifted forward.)

B. Drop back knee toward floor and bend front knee until it is directly over your ankle.

Keep weight on your back toes and drop the back knee toward the floor - but don't let it touch the floor.

(Back knee supports much of body weight, while also turning to create torque in the swing.)

In genu recurvatum (back knee), normal extension is increased.

Genu recurvatum is also called knee hyperextension and back knee.

Athlete takes a large step forward, bends the forward knee until the back knee makes contact with the ground, and rises.

Quicker than he looked, Swashte feinted with a straightened left arm, then threw a half-kick at my back knee.

Then he steadied her with a hand on her arm as they galloped back knee to knee.

The warrior ducked as the flying metal whistled toward his face, then leaped into the air as the return stroke came back knee high.

Like Giambi, McGwire battled injuries to his back knee, the one used to push off when swinging.

Giambi has adjusted his stance to make himself more comfortable, slightly opening his hips on Tuesday to take pressure off his back knee.

Be sure your back knee is pointing directly toward the floor and your front knee is aligned with your ankle.

Genu recurvatum (Sway back knees) is also a factor that forces a dancer to adjust into un-stable postures.

Genu recurvatum (back knee)

Uncertainty Continues "We really won't know," said Manager Dave Johnson, "until he squats on that back knee and fires."

Standing with feet hip-width apart, take a big step forward with one leg, then lower your body toward the floor, front knee aligned with ankle, back knee pointing to the floor.

Depending on the lineage and circumstances, the back knee can be down or up, the toes may be tucked or untucked, and the arms may be in any number of positions.