I'm 26, going to start doing adult Ballet classes....?

...once a week. Will my body really become strong, toned and improved posture? What are the other benefits?

I'm 26, going to start doing adult Ballet classes....?performing shows

In addition to what you said, you will become more flexible, your range of motion will increase and you will learn to walk and move more gracefully. Once it's your second nature, everything you do will look more beautiful - every turn of your head, every hand gesture. You won't even notice it, other people will. Your coordination will improve too. If you find yourslef really into ballet, you'll start paying even more attention to your diet wich is always a good habit.

I'm 26, going to start doing adult Ballet classes....?say yes opera theater

you will find that the first class will make you sore.But keep going cause the benefits to your posture,tone and overall strength will be very evident.It will also improve your balance,mood and stamina. enjoy!
you'll make a lot of friends and you'll become very flexiable

- have fun

hope you enjoy ballet
Since you are an adult it's okay to join whenever you want to. But if you are think of becoming a professional dancer then it's already too late. Because you have to start from a early age from 7-10 years old for your body to train. Your body will gain muscles and will lengthen, ballet helps you have really good posture but since your bones are permenent you will have to try hard to keep this posture stay in place. But I reccoment you doing ballet more than once a week if you want these things to happen easier and faster. The other benefits are confidence, and stretching your muscles.
SOUNDS GREAT! good for trying ballet! make sure u don't have any leg injuries or it will cause tendonitus!
You WILL become somewhat more toned, slightly stronger and your posture will radically improve. Don't expect too much with just one class/week though. Two classes/week would be better, but I am sure you have time constraints etc. BTW...Good for you! Ballet is a great way to develop fitness, poise, grace and a better frame of mind. All the things that Ms. Snowflake said... It helped me with depression.
how do i do the moves to walk it out
Yes, my sisters posture improved dramatically, plus she was more limber and able to better particpate in other types of sports due to her increased mobility.