David Keil of yoganatomy published an article about the challenges and requirements of learning to do handstand.
One of the key points that he mentions is the need to keep the shoulders in front of the wrists while doing handstand.
I've personally found this shoulder positioning is helpful both while jumping up into handstand, and depending on body positioning, also while holding handstand.
This same shoulder control and shoulder awareness is needed to do jump backs "lightly" during sun salutations.
The following are some of the exercises that I've used to teach the required awareness before doing a full sun salute.
This same awareness can then be applied while jumping up into handstand.
The first exercise starts in cat pose.
Spread the shoulder blades to lift the ribcage. Press the finger tips into the floor. Then shift the upper body forwards so that the shoulders move ahead of the wrists. Then return to the start.
The top two pictures show the shoulders relaxed and then shoulder blades spread (using serratus anterior.)
The bottom two pictures show me moving my shoulders ahead of the wrists. Try moving forwards and backwards slowly and see if you can feel the change in relationship between shoulders and wrists.
Repeat a few times moving gradually further forwards each time.
The shoulder blade spreading action is to activate the serratus anterior muscle.
After a rest try the same exercise with the knees lifted to add a little bit more weight to the arms. Remember to press the finger tips into the floor and spread the shoulder blades.
You could also try the same exercise in plank pose.
Because when doing an ashtanga jump back you end up in chaturanga dandasana position you can practice more or less the same exercise with elbows bent.
Then to move into full chaturanga, start in childs pose, shift your weight forwards with elbows bent, then straighten the knees.
The reason for starting in childs pose and then moving forwards is to get used to the idea of moving the shoulders forwards relative to the hands... with the elbows bent.
For extra points try to create a spreading action on the inner edges of the shoulder blades. The shoulder blades will naturally move towards each other in chaturanga dandasana because the elbows are bent besides the waist, but try to resist this action so that the serratus anterior muscle on both sides is active.
Next stand with knees bent and hands on the floor. With Shoulder blades spread (protracted) and fingers active, lean your weight into your hands and shift your body and shoulders a little bit forwards, then shift back. Start with your hands ahead of your feet.
Next as you shift your weight forwards onto your hands hop your feet up. After your feet come down shift weight back onto your feet.
Notice the angle of my arms as I lean forwards and hop my feet. The second row of pictures is a close up of the first row.
First my shoulders are over my hands, then I lean my shoulders forwards. Then I jump while keeping my shoulders forwards.
Repeat this a few times.
Then as you hop try to move your feet back while keeping shoulders forwards.
Repeat this a few times working at moving your feet back further each time. Reset the feet after landing (walk or hop them forwards or walk your hands back to a position just in front of the feet.)
After some practice see if you can jump back into plank pose. Ideally, if you are keeping your shoulders forwards your feet will land a little more lightly on the ground since you are working at keeping your weight forwards.
Jumping Back to Plank Pose. Notice in the top two pictures to the left how I'm keeping my hips over my hands.
Next you can work at bending the elbows prior to your feet touching the floor.
Continue to work at keeping the shoulders ahead of the wrists (which may actually be a little bit easier on the wrists once you start bending your elbows.)
Jumping back to Chaturanga Dandasana.
In the top right picture especially, notice how my hips are over my hands.
If you are sensitive enough, focus on feeling your hands as you jump back and keep your weight over your hands for as long as possible.
This same trick, both that of feeling your hands, and that of keeping your shoulders forwards can be used to help make working towards handstand a little bit easier.
As for actually jumping up into handstand, next time you try it whether with both legs or whether scissor kicking, start with your shoulders ahead of your wrists. Remember to keep the shoulder blades spread and the fingers active. Keep your shoulders ahead of your wrists as you jump or kick up.
You may have to vary how far your shoulders are forwards depending your the position and shape of the rest of your body. (But so that you know the right position for your shoulders, feel your hands!)
The seated get up is a way of getting into the one legged squat from a seated position. Even if you aren't interested in one leg squats this video does include tips on stabilizing the knees (at about the 5 minute mark.) Usual muscle activations for knee stability might include the quads, the hamstrings or any of the glutes. This looks at another set of muscles all together. If you like the video or find it helpful, please do share it! Thanks!
Some tips for learning how to do deep squats (without weight). The first tip is on how to stay balanced while squatting.
How do you learn the body weight safely? How do you work towards this pose even if you aren't sure if you are capable of doing it.
Basic yoga poses: standing, sitting, arm balances, binds, twists, inversions, back bending, front bends.
Scapular stabilization becomes a little bit harder when working agains the weight of the body. It can be easier to learn if you gradually increase the amount of body weight the scapular stabilizer muscles are working againsts..
Some hip flexor strengthening exercises.
These yoga poses can be used as arm strengthening exercises.
Turn yoga poses into leg strengthening exercises using floor pressing actions, leverage and friction.
One way of finding and fixing hip problems is to do standing hip strengthening exercises while balancing on one leg.
Knee anatomy for yoga teachers looks at the bones and muscles that comprise the back of the knee in simple terms.
Working towards a kneeling quadriceps stretch you first need to be able to kneel. If you have difficulty kneeling, you may find it helps to activate your quadriceps.
When doing quadriceps stretching it may help to activate and then relax your quadriceps in these standing, lunging, pigeon and supine yoga pose variations.
Some exercises and yoga poses for working towards a lying quadriceps stretch one leg at a time.
What are the benefits of the Dance of Shiva? Arm strength and balance, learning to learn and improving creativity.
This yoga routine video is designed to help you strengthen your arms and legs via the use of friction and pressure. It also teaches you how to become more aware of your body.
The transverse abdominis muscle can be broken down into three parts. Transverse abdominal exercises can thus affect the SI Joint, lumbar spine and the lower portion of the ribcage.
To improve the resiliency of your knees it can help to exercise them in a variety of positions. The following yoga poses can be used as knee strengthening exercises. The trick is to activate your knees while doing them.
Learn to consciously control your quads and hip flexors with Conscious Muscle Control: Quads and Superficial Hip Flexors. This downloadable video course teaches you how to feel and activate your quadriceps (the vastus muscles) as well as the rectus femoris, tensor fascae latae and sartorius muscles.
For any calf stretch you have to bend your ankle forwards to stretch the soleus and/or gastrocnemius. How you bend the ankle forwards can make the stretch more or less effective.
Yoga for flexibility with stretches for the hips, quads, hamstrings, glutes, psoas, shoulders and arms. These yoga stretches are designed to improve flexiblity.