Thanks for the PM invite, Shana.
Fred already has some good suggestions and comments here. There's only a little that I disagree with, and I see a developing consensus on the disagreements.
My wife was one of the earliest women bodybuilders. She won "Miss Richmond" (as a Charlottesville resident) in the mid-1980s, and was written up in the Richmond Times Dispatch. It was such a novel thing for women at the time (in THIS country) to be engaged in working with weights.
I had such a hard time convincing my female karate students at the time (80s) to get in the weight room. The comment was generally something like "I don't want to look like Arnold!" Well... if a woman isn't doing anabolic steroids, she won't look like Arnold. She'll look like a fit woman.
FWIW, my wife quit that whole scene when she noted her competitors were getting deeper voices and stubble on the chin. Can you say modern pharmacology? <Sigh...
Given Fred's specific questions, these are my comments.
1) Indeed NOBODY should be training the same body part every day.
Weight training is about taking one step back (the day you lift) and two steps forward (the day or days that you rest). So if your daughter really does want to lift every day, do the split routine method that Jake suggested. For what it's worth, I split routine. I have 3 different workouts that I alternate in-between. Most just have 2.
2) The two biggest issues here are the growth plates and overtraining.
If your daughter has finished growing, she can lift all she wants. If not, have her do less weight and more reps. Make her concentrate on the open chain exercises and tell her that form will be much more important than the amount of weight she lifts.
ANY athlete - male or female - can overtrain. I've been there, done that. For a male, signs of overtraining include an increase in number of colds caught, plateauing, etc. For a woman, a good thing to monitor is her period. If she's been through menarche, then she should be having regular periods. Sometimes female athletes will go through menarche a little later, and that's not necessarily bad. But if she's of age and the periods disappear, that's a warning sign that she's doing too much.
Just to give you an idea what CAN be done though... My wife got no help (zero, zilch, nada) when she was pregnant with my first son. She wanted to lift, but nobody would dare give her advice. But she was an athlete all her life, so she just listened to her body. She weight trained until a week before she delivered number 1 son. He was 9 pounds, 7.5 ounces. That's a big one!
So you see... women CAN lift and get on with their female functions.
3) Women can lift heavy just like men.
Note that I didn't say girls. I said women. They can benefit just like the men can, only in a slightly different way. If a woman is eating right and not overtraining, weight-bearing exercise will load her bones up with calcium. She'll be at lower risk for osteoporosis later on in life. The same cannot be said for aerobics, by the way.
Women will get stronger more by neuromuscular coordination than by size gains. But they will get bigger. Even women have some testosterone - some women more than others. FWIW, it's part of what gives a woman her sex drive.
Mostly women gain by making themselves stronger and immunizing themselves against certain types of injuries.
And just to blow holes in the stereotypes... Both my wife and one of my female karate students were notorious at UVa for lifting a LOT of weight. There were days when my wife (before we married) would go into the weight room near the 1st year dorms and do flies with 45 pound dumbbells. I can't count how many times I would see skinny guys get up and leave rather than be shown up by "a girl." And my wife looked just fine at the time.
Another female karate student of mine was well known in the weight room for benching 135 on a regular basis. (Two 45 pound plates on the bar.) She was the ONLY woman at the time doing anything near that on the bench. That by the way was the same time that she suddenly appeared in Playboy magazine (September 1983
) in a "Girls of the ACC" special. Nothing left to the imagination. And yea, she looked great. (She's now a practicing attorney.)
4) Remember that your daughter is NOT doing bodybuilding. She is training with weights.
Weight training is a means to an end. She isn't trying to pose; she is trying to be a better athlete. Focusing on multiple muscle group, open chain exercises is key.
5) Abs are just like any other muscle.
I don't recommend people do abs every day. They need to rest just like any other muscle. Furthermore... If you are doing exercises like classic Olympic lifts, you are working the core pretty hard there already. The ab and lumbar work should be "clean up" work on those days.
6) Do not exercise within 2 hours after lifting.
If you insist on training and lifting on the same day, I suggest doing the lifting as the last part of your day's workout.
7) Stretch the muscles you are working - while they are warm.
Warm muscles stretch better. Martial artists in particular need flexibility as well as strength. Weight training days are a good time to work on flexibility. But don't stretch before lifting. Stretch in-between or after sets.
8) You cannot spot-lose weight via exercise.
Some men and women want to work certain muscle groups (like the abs or hip abductors) to lose weight in certain parts of their body. Sorry... it doesn't work that way. Your genetic makeup will determine where you first put weight on, and where it will first come off. Some women put it on the breasts, and don't seem to mind that. Some men and women put it on the midsection, which isn't very healthy or beautiful. Some put it on below the waist, which isn't so bad even if not very aesthetically pleasing. But the most important thing to remember is that YOUR BODY will determine where you will gain or lose weight.
The good news is that more muscle mass gives you a higher basal metabolic rate. A high BMR means you burn calories even when sitting on your butt. And that isn't such a bad thing. In fact... A weight trainer can often get away with eating like a horse, and look fantastic.
Hope all that helps, Fred!