plies; arched/cruved back exercise and devlopment

Before the video even starts you can see by the shot that i am doing a very low plie and i am trying to make this stonger so i can get lower and achieve a better plie. Also you can see that my back is curved well. At 0.02 you can see that i have a curved back that could use improvements but for a first time is good, and my plie is still good but  knees could come out further to make it a better plie. at 0.07 you can see that i am going alot faster than the other people ion my class so i need to slow down and make it more smoother  I have also got to try and not stick my stomach out so mach and just move my back. at 0.31 you can see we have steped into second position and started our first plie with an arched back. i  think that my pluie is good, still needs improvement like moving my knees out further but i could do this by streching more so it wont hurt as much if i go lower. At 0.32 we curve out back. i think that i have a good curve and a good plie. at 0.38 we start to rotate our back. i think i rotate my back good and  rotate alot of the spine but i need to not stick my stomach out so much! at 0.56 we start the development. at 0.57 i have finshed my plie and start to come up, i think that i can definatly go lower on this and maked more improvements. 1.03 - embarrassment of my life!!! my bum is sticking out so much i need to get a straight back and not stick my bum out. 1.13 bouncing, this really hurt im leg muscles but i kept going as i really want to achieve getting lower and improving my plie, here again i also need to bring my bum back in! At 1.27 you can see that my foot is up and is a good point. At 1.31 we had to hold ourseleves up, i think i had pulled my back up straight and sucked my bum in more at this point but i sdo start to lose balacnce as time goes on and start to stick it out AGAIN!

Improvements:
- stuck bum in
- improve plies and get lower
- improve balance when holding myself up on my toes
- dont stick stomach out when rotating

How to improve these:
- practice going down into plie slowly, making sure bum is in and not out and the develop it by holding myself up on toes
- strech leg muscles more often
- practice holding myself up on toes at home and hold on to something and then take it away
- pactice rotations on upper back only so stomach doesnt come out.