as a former coach and athlete, this kind of guarantee is ridiculous.

as a coach, i busted my butt in every private for every kid i ever taught.  i had one girl in privates for 2 years, never got a backhandspring.  by the end of the 2 years, she had straight cartwheels, perfect handstands, and a bridge kick over, which in and of its self was an accomplishment for her!  i had to pull out all the stops for her, manipulating mats, lines, hand prints, etc.  but let me tell you, when she finally kicked that bridge over by herself, her face was priceless!  i had another girl, also for 2 years, who only took 6 months to get a backhandspring, but struggled a little with tucks.  threw her head back out of her set and it took about 6 months to break the habbit.  but i refused to move on with her because thats just setting up for horrible (and dangerous) fulls down the road, and her mom understood.  i had another kid who took 2 years to get a handspring, and then got her tuck almost perfect, by herself, in 1 month. 

my point:  every kid is SO different, that there's no way to make such a guarantee.  not to mention, any coach who would, would be irresponsiblly pushing some kids into forming bad habbits that are a cause for ugly and dangerous tumbling.  (i'm a stickler for basics and technique- it makes the hard stuff so much easier.)

as an athlete, i'm a chicken.  a BIG chicken.  i am (or was..) an all around level 5 athlete with a gymnastics background.  when i first started at motions, i had very pretty layouts, but no full.  it took a little over a whole year, with nelson spotting me almost every day of the week, out of the same corner, for me to finally throw it by myself.  (i closed my eyes when i ran when i first competed it because it wasn't "my corner.")  i know i know, his fault for actually spotting me for that long, right?  nope.  i was the kind of kid that was so scared that i would just refuse.  i didn't get emotional, "punishing" me didn't work, coaxing me or bribing me didn't work, i really had no buttons to push.  i just wouldn't do it.  nelson was patient, worked with me EVERY day.  not just the days i had practice, but every day.  and finally, my body decided i could do it one day.

my point:  there is a strange connection between the body and the mind, that many people who have never experienced a mental block don't understand.  there is a trigger that says no, and when it does, your body freezes.  and its VERY scary.  many athletes deal with it by forming a mental block that almost wont allow you to perform a skill unless conditions are comfortable.  for me, it was just seeing nelson out of the corner of my eye as i twisted.  for others, its the feel of a hand on the back as they jump, and for some its being in the correct part of the room.  a guarantee could NEVER work for kids like this, for kids who were or are like me.