Training advice

Hello guys! I am 15 years old, 1.81cm and 66kg.. I need help.. I decided to run my first xc race in the april.. The race is 42km.. My trainings now contain 30-45km of xc-all mountain rides.. Where should i concetrate now about my training?
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If you run out of energy after an hour, do lots of long rides (actually it's a good idea to start with some steady miles anyway as a base). If you can't climb, then do lots of hills. If you can ride all day, but lack top end speed then do short, sharp intervals. You get the picture.
Something else..Do you think that i should start gym for some excersises for my legs or it is unnecessary?
http://www.bikeradar.com/fitness/training
'njee20' has summed it up. When we talk about weakness, it's more about where can your training be focused to improve your speed or endurance. Only you will be able to work out what these are from riding.
Find a decent route.. maybe 30-60mins in length with some decent hills..Ride at race speed for a few hours... you'll soon work out what your weaknesses are.
If you find it easy... you need to be riding much faster! (or you are already a cycling god)
I personally find gym work v useful, as I find I can push my fitness much more than on the bike (as I don't have to worry about crashing!).. But I don't think you can really beat mileage on the bike.
Oh and stay away from the gym if you can, you'll be building muscular strength which isn't massively important at all and it'll add weight, the necessary strength will come from hill training and pushing that big gear. So this could be an example.
Mon: 1 hr ride
Tues: Hill training
Wednesday: 1hr ride pushing big gear
Thursday: Rest
Friday: Interval Training
Saturday: Race Distance Ride
Sunday: Rest.
oh and remember every 4th week have a week involving just rest days this allows the body to repair and recover and actually become fitter.
Really you need to be good at everything to do well! You're going into a v competitive category too!
As for gym work, opinion varies, I think a session doing core stability is good, but you can do that at home, I wouldn't substitute a ride for the gym if you're only riding 3 times a week. Consecutive days also isnt ideal, but there's presumably not much you can do there.
neily about my height my secret is the milk..the only think i am worrying about is my frame..if i go 1.87++ i will have to take a XL..