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I am not a very active guy but on yesterday I went to the gym and every other part of my body is fine APART from my thighs! they still kill, i cant bend over without them hurting?

After exercising a lot, a certain acid develops near your muscles. To split the acids up take a hot bath or the less enjoyable activity - exercise more. That's at least what I remember from school. If anyone wants to suggest something better, go ahead.

That acid being lactic acid.

Oh the things Newbies do in order to get their post count up. Okay I will bite.

In addition to the lactic acid, its also the tearing of the muscles that is involved.  As your body uses proteins and things to rebuild the muscle, it actually comes back stronger and larger.  The key to getting over the pain is to continue doing it.  You have to know the difference between "Oh, I think I injured myself" and being just sore from working out.

there is nothing wrong with that they are just sore, take a day off then workout again and you will be okay

Thanks for naming it. I know how it's called in my native language but not in english.

It will hurt for a while but as you do more regular exercise then after a workout you will get a pleasant-exhausted feeling in your muscles, I wouldn't call it 'pain'. If I run a few kilometers it feels really great stretching afterwards.

It's Delayed Onset Muscle Soreness. It's a usual reaction for the untrained. The worst pain will be at about 24 hours after the workout, then it'll diminish.

The severity of DOMS will gradually lessen as you get more experience with exercise. It will never go away entirely but it will be more "pleasant", as strange as that sounds. With time you will learn to expect, even to crave the feeling.

Thats totally normal, Just means you need to exercise your thighs more then the rest of your body until they stop getting sore.

It also means you did a bit too much.

Not necessarily.  It just means he might have done more than what his muscles are used to.  Common with new exercises, working out for the first time, or pushing past a previous limit.  If he just began running, or ran further than before, its just soreness from muscles doing work.

Any work above 70% intensity usually results in lactic acid build-up, but any pro-longed exercise will eventually result in lactic acid also.

From a scientific perspective that is a completely meaningless statement. How much lactic acid will build up and in what concentration?. What effect will this have? How quickly is it removed or neutralized? What concentration threshold must be reached for any negative effects to be experienced (pain?).

A lot of people think that 'acid = bad' because of a poor understanding of chemistry and/or the world around them, neglecting the fact that the human body contains countless acidic substances that perform a multitude of tasks either directly or indirectly or form as a by-product of other processes. Saying exercise will result in lactic acid buildup is almost meaningless even if it is true.

You are wrong, lactic acid is not what cause that.


greyhawk is right

https://en.wikipedia.org/wiki/Delayed_onset_muscle_soreness

Tell your boyfriend you have piles.

Wrong.

During power exercises such as sprinting, when the rate of demand for energy is high, glucose is broken down and oxidized to pyruvate, and lactate is produced from the pyruvate faster than the tissues can remove it, so lactate concentration begins to rise.

Citation: http://en.wikipedia.org/wiki/Lactic_acid#Exercise_and_lactate

It's both right. You have the increase in lactate concentration which causes the immediate soreness after training which disappears rather quickly and there's the microruptures in tissue which causes the soreness experienced in DOMS 24 hours later.

They say that eating protein after you work out will help your muscles repair faster which will decrease soreness.

Hmmm

take a cold shower or ice bath. also shake your thighs to get the latic acid out, drink tons of water, and STRETCH BEFORE AND AFTER EXERCISE (MOST IMPORTANT) and continue to exercise every week. don't give up, not being able to get off the shitter been there done that but your body get used to working out and your legs/ muscles won't  stiffen up anymore.

solid advice

or just don't exercise, they'll have pill for that soon enough!

You're the problem, not the solution.

never said it was a solution, was just an option.

Actually, if you read the articles posted earlier it's the opposite of solid advice. Besides the obvious encouragement to keep exercising of course :)