Building strength for Jump Back : Lolasana excercises

Received this in my mailbox this afternoon.

"I have a question for you. My jump backs suck and cannot even begin to speculate Lolasana. What do you recommend to even begin to build that strength? I'm looking at your first post and I'm nowhere close to either of those videos. Any thoughts or recommendations would be greatly appreciated.
Thank you in advance."

And my attempt at a reply

"I'll have a think about strength building and and try to post something.

You say you can't even speculate about Lolasana but I think it's key. It's that middle point we pass through in both Jump back and Jump through. The good thing is it seems perfect for building strength too.

Get on your knees, hands down by the side just back from the knees, breathe out and then as you breath in, strongly sucking in your belly press down with the hands to lift up using your feet as a kind of pivot point, almost as if your rocking back onto your feet. Go down and then come back up again creating some momentum up and down to help you. I think that employs lots of the elements you need for the jump back and builds strength in the belly, arms, shoulders etc.

You can build up to leaning back less, which is harder on the arms and shoulders. Oh, and work your hands back till you end up mid thigh. Have a go at doing it with the ankles crossed. Try to work it in to your transition.

What are you doing for Jump back and Jump through at the moment. Can you jump back to your knees from downward dog and do one of these lolasana exercises each time, that would be what 23 times or so in all of primary. Jumping back ....cross your legs rock forward onto your knees and then a quick lolasana exercise before stepping back to plank. That's another 23.

Keep it light and simple at first and you can see that 50 of those each morning and you'll start building strength in no time and best of all it fits into the practise.
After a while that rocking up and down can become little hops, bringing your toes off the ground. And later hopping up and trying to hold for a second or two.

Does that help, give it a try and let me know. Will see about making a video of what I mean and post it later today (see above)."

This blog start from around June 08 and videos here from Feb 08 (just realised it's a year)http://grimmly2007.blogspot.com/2008/09/my-jump-back-videos-feb-08-to-present.html
However, I recently found this buried away on the other Mac .
I think it was taken in Nov 07

Anyone one else got any strength building suggestions?