Endurance running/weight training?

Okay im 16 years old, weigh 113 lbs, and am 5'8'' I've been weight training for about 4 months and want to join my schools track team in may/june for long jump and/or running 400 m +. I weight train 3 x a week Mon, Tues and Thurs and am wondering how much cardio I should do on top of my weight training to gain as much endurance as I can.

I was thinking about this,
Mon - weights (upper body 45-60 min)
Tues- weights (lower body 45-60 min)
Wed - cardio (run for 30-40 min)
Thurs - weights ( equal combo of upper/lower body 45-60 min)
Fri - cardio (run for 30-40 min)
Sat - cardio (run for 30-40 min)
Sun - rest

Is this way to much? Any suggestions on what type of weight training exercises I would benefit most from? Or if I should adjust my cardio scheduale?

Any answers to any of these questions are greatly appreciated, thanks

In response to the first reply I seem to have a wicked metabolism, thats why im doing the weight and worried that if I start running again that all the mass I gain from weight training will be gone. At least 150 lbs? I wouldn't be able to run **** if I gained that much I'm thinking more like 125-130 (basing that on what my bmi indicates is a good weight for my age)

the schedule's pretty good, but here are some suggestions; you'll also learn what works for you along the way as you go along. you should try to eat lots of carbs and protein because you dont weigh very much at all and if you're doing weights, the carbs will give you the energy you need and the protein will help you build your muscle tissue. that doesnt mean stop eating everything else, just take in more carbs and protein on top of what you normally eat. drink lots of milk, it helps keep your bones strong so when you're pounding your knees while running or lifting heavy wieghts, your bones will be able to hang in there and you won't have any problems with them and you wont get injured as easily. it also naturally increases your hormone levels so you'll get stronger faster. when you're doing weights, do low reps at a higher weight because that will increase your strength and build more muscle, while cardio will build your endurance. try and build up the time you spend on everything. shoot for at least an hour on monday when you're doing upper body. legs is probably good at 45-60. when you're running, try to set a distance goal and then once you're comfortable with that distance, try and see how quickly you can run that distance. instead of doing the combo on thursday, you should do a core workout. without a core, your upper and lower body are pretty useless. you core muscles help you balance everything else and they are you upper and lower abdominals, spinal erectors (lower back muscles) and obliques (either side of your stomach) and there are plently of excercises you can do for them i wont get into that. a strong core will help you throw yourself further and have better balance when you land so you will be able to put your feet out further and not fall backwards on your *** when you hit the sand. it'll also help your 400m because a good core will improve your breathing teachnique and keep you straight while you're running so your stride will be more efficient. at first your core workouts will not be long at all, but over time you'll build it up to an hour or so. thats about all i can think of...good luck!

p.s. ( i just read your additional comments...150 pounds is something to shoot for, as you get heavier, your legs will get stronger also, theres no need to worry about that, and cardio wont take away from your muscle unless you've burned through everything you've eaten, and all your body fat. after you have 0% body fat, you'll start eating away at your muscle. so pretty much you're safe

p.p.s. when you're in the gym, if you're doing an excercise that you can do either on a machine or with freeweights, go with the freeweights, they work all the stabilizing muscles as well which is what you need for performance in any sport, not just the main muscles

omg do it u need muscle. gain weight dude. u should atleast weigh 150.

That is just perfect! And you also have to practice sprinting. I'm in track too, its starting this spring.