반신욕 means half-bath.
You fill bathtub with very hot water but only high enough so if you sit down in it,it will only reach your belly button area.
And then you sit in it for as long as you can (try for 40 minute at least) but you can't get the upper part wet and must keep hands and top part dry.
The temperature difference between top and bottom parts of body make you sweat a LOT and afterward, you feel exhausted like you ran on treadmill.
Be careful when you do it and drink cold water after and get up carefully because you can faint..
you have to eat very healthy when you are doing this bath everyday to lose weight ^^
It is very popular in Korea and they even have spas and different products to put over the tub so you can do other stuff while bathing.
Someone even made a ban sin yohk tub with a computer above it ^^

What it looks like~





And for Ahyoomee's diet:
link= empas news
It's said that "Cutie Honey" solo from group Sugar, Ahyoomee lost 8kg from ban sin yohk diet.
During interview with Star News, Ahyoomee said "I did ban sin yohk everyday for 30 minuts for a month and lost a lot of weight, and the difference between when I was biggest is about 8kg loss."
......
Ahyoomee said "Ban sin yohk is good for you blood circulation, and your skin too. It helps alot with stress too."
Also: "I didn't do any special exercise but I still had dance practice and lost weight in my boobs and lost a lot of flab"...


Other than Ahyoomee, other people are
Supermodel Jo So Hyun empas blog
Lee Hyori uses it with in-line skating empas cafe & newsen.co.kr
Honey Lee (Miss Korea) yahoo.co.kr news
Lee Bo Young uses for her skin newsen.co.kr
and if you go to this site = Han Hye Jin (from Ju Mong), talent Park Jung Su used it for her skin,
Bi (Rain) uses ban sin yohk for dieting and voice practice
a couple of years ago, Bi said he had "ban sin yohk mania" --> article


ALL THE ANNOYING PEOPLE WHO SAY IT IS A "FAD"
Just be quiet and keep it to yourself.
Yes I am sure you know everything about the universe.
But if you are Korean or Japanese, you probably heard of this before as method to cleanse your system.. If you detoxify, your metabolism will be more efficient because doesn't need to work so hard on absorbing nutrients,etc. because of dirty kidney/colon/etc.
SITTING IN A BATHTUB IS NOT A "DIET". That is why it's suggested you eat healthily and do this bathing at the same time to lose weight.
It also says Ahyoomee danced while she did it.
While dance practice might not seem like a lot, she is an entertainer, so she probably dance 5+ hours/day

I'm sorry but this is a joke. Losing weight by soaking in a hot tub LOL...

God forbid exercising.

this is the wierdest diet i've ever seen. o.0

what will koreans come up with next? :x

O_O
WOW, and this works?
haha, thats so cool!! wait, but wouldnt you just be losing weight from all the loss of the fluids in yr body --> sweat?

LOL this must be the mother of all fads

How is it a fad?
Ban sin yohk has been around from before we were all born.
It's mainly use for poor blood circulation but it does to help lose weight.

^ I agree..
It forces you to sweat all that water weight out.
I don't think I'd be able to handle the heat though, hahah.

Thanks for sharing~

Actually, this is pretty similar to bath house/hot springs/sauna detox methods.

"The contrast between hot and cold water increases microcirculation through body tissues, promotes detoxification, and strengthens the immune system. This helps bring nutrients, oxygen and immune cells to damaged and stressed tissues and carries away metabolic waste, inflammatory by-products and other toxic substances. Contrast showers also strengthen the immune system by increasing the number of white blood cells."


Taken from About.com Skin Cleansing and Detox

I did a similar thing: by heat
it doesn't work for me
but thanks for posting the info

Cool!!..It helps the blood circulation also..
I want to try it...

seriously people should just exercise!

^ agree. Excersising is like the best thing to do. Too bad it's not very easy.

I'd like to try this. Although not to lose weight, just for the other health benefits.

Is there like a certain temperature the water has to be? I usually take a bath with uber hot water and it gets cold fast.

lol isnt this just an at home sauna?

well ahyoome did loose alot of weight.
hmmm, maybe I should try this out

this jsut like sitting in a sauna.

the first picture is cute. haha she looks happy in that hot water
but yea, this is so weird

this is so weird!!
but interesting..

i should try it..LOL. just in case it works.

.... it's like a sauna....

seriously, just exercise. the hard work will pay off. you can't get real results without it. there is no such thing as an easy way.

Actually I think it may work... heat increases rate of activity by the cells in the body... which means your overall metabolism increases and uses up more energy/calories to do work. Plus soaking also removes toxins when you sweat in the bath... elimination of toxins helps in losing weight. However, I'm not sure if it can actually help one lose THAT much weight...

yeah i was thinking of sauna as well lol. i agree just exercise lol but i guess this is for the people who are lazy to do cardio xD

seems better to just exercise for 30 minutes but i guess this is the easier way out.
i'm pretty sure they watched what they ate when they were doing this too becuase if you eat a lot and do this, it probably won't help as much.

My dad would kill me if i took so long in the bathtub..even though i usually do that...but i'd rather excercise=_= it makes me feel better than doing nothing sitting in a tub of hot water waiting to get thin^-^
but i'll try this so i can get the toxins out o.O
EDIT::DETOX Ahahaha!!! @_@

wow it seems interesting and fun xD but the lazy way but also looks really relaxing xD
i didnt know so much celebs use this method

Wouldn't it be better to go to a Sauna though? And no offense, but after 20 minutes, the water would've gone cold (for me anyways)

I saw this in a movie recently and was like, 'Is it an at home spa?' but I guess not completely. LOL

I doubt Ayoomee did only THIS to lose weight.. How could she lose it so quickly by only this and dance practice?

Anyway, this seems like a cool idea though. I'm sure it could help in the process of losing weight, since all the sweat comes out of your body.

I heard about this when I visited korea but I never tried it... maybe I should LOL

woww~ i wanna try this. LOL. seems soo relaxingg..but i wonder if it really workss..x_x

Hmmm, I gotta try this.
But then I'll probably get in trouble for hogging the bathroom for so long xD

EDIT:
I just tried this about 10 minutes ago.
I'm not sure if it worked cause it was only my first time, but boy did I sweat! Lol~
So it must've done a lot cause I was pretty tired when I was done.
I think I should've done longer than 45 minutes :/

hahas. yeahh i tried it before..well..once only.
it did help me sweat A LOT.
like..in about 20-30 mins, my upper body was full of sweat o.o;
and the water didn't really turn cold, it was still warm.
however, it made me kinda dizzy and i felt really weak afterwards, so i stopped doing it.

uhh does this really work? it doesnt sound very... convincing

i wanna try it but i have to find something to cover the bathtub so the heat doesn't run out. o_o

you guys should do it if you can.

i do it sometimes, not as a diet, but because it's ridiculously healthy.

it makes your blood circulation work splendidly and all that fun stuff.

but after, i'm so weeak. once i was trying to go down the stairs and i was like "wow, i'm just going to chill on the 5th step for a second. i'm tired" and so i sat down and i watched the scenery. oh yes.

anyways, on all those fancy health shows on korean cables, they recommend this a lot.
har har har.

wow, I never heard of such things. so many things you can learn here. Interesting, I think I will try it out to detoxify my body.

o.o wow I'd try this, but. I think
I'll stick with exercising ^^;

The perfect way to lose weight for the lazy people in the world.

you probably only loose water weight

Haha, it's like a home sauna.

That very interesting..
Does it actually work..?
And how much do you use? @_@

i've actaulyl done similar things adn its so uncomfortable sitting in ther afo 10 mintues even for me @_@

that's so stupid.
haven't people heard of EXERCISE?
it's beneficial for your health and you won't faint if you do the right amount.

isn't it really really hot oO;;;;;... nja I think I'll give it a try lolz

isn't this kinda similar ta the way a sauna works?

oh well, to each their own`

lol~ the picture is cute (:

um.. wow. I always thought ahyoomee did the SM diet.. O__o

exercising is a lot more beneficial but ppl are lazy.. >__<

it kinda sounds....unsafe...
you might faint?

exercise does, of course, takes some time...months, and years for some
but it is the safest~

This makes me wish i owned a bath, I only have a shower T_T

I think i would go for a run instead if i wanted to lose weigh! But it is
interesting info! ^^

thanks for posting this! (:
i might try it! but wouldnt the water get cold during the 40 minute period O_o