whats the best way to train ???

I really need some advice . Im training to do a half marathon and have been training hard 5 days out of 7 im doing some sort of class or run .What i really need to know is whats best weights,spin or resistance training? I could do with losing a couple of pounds too and i know running is the best way . But i keep being told using weights is great for strengh building and spin classes are good for CV but having the time to do all this is difficult also i have found my legs are feeling very fatigued. any help or advice would be great

I'm biased, so I would say weights, but a more sensible answer would be to do that which you're drawn to.  Something to consider about weight training is that muscle requires energy just to exist, so by building a bit more muscle, you'll burn extra calories  

You don't need to train hard all the time either.  I would run 3 or (if you really want to) 4 times per week.  Do your long run, a second run that is about 2/3 the length of your long run and a tempo run.  This will be the optimum way to train. Going hard all the time will just run you down.

Doing weights twice per week would be good, but just limit yourself to 2 sets, so as not to deplete your energy.  Then you could do an exercise class on the 6th day.

thanks . ive been doing more weight sessions so maybe ive just tired myself out . but a year ago i didnt worry about doing weights and just enjoyed running now im not enjoying it as much its becoming a chore

In that case, you really would be fine with running 3 times per week and doing weights (or one of your other choices) a couple of times per week.  That way, you will have 2 days off each week to recover.  

It might be worth getting a heart rate monitor, to guide your running efforts.  I found it invaluable when I first got back into running a few years ago.  I was running too fast and consequently found it hard to build up mileage for the 1/2 marathon I was training for.