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  I think youll do well as long as you  jump plenty along the way and dont get fat.  Ive never seen a true lbm gain be detrimental to athleticism in the event the athlete didnt stop running/ jumping/ playing their sport at a high frequency. 

  Think about this, grab a 5lb piece of steak and take note of the space it takes up and density.  Now imagine that on your glutes and hamstrings, and keep in mind thats ONLY 5 lbs of meat...  The amount of lean tissue you can likely build, that is contractile, and HELPS you move,  will not hurt you.  fat that is not contractile will. 

  People look at elite sprinters and high jumpers and correlate their weight with performance, only they dont note the bone structure.  Many of those guys have insanely light frames, and even though they appear "thinish" they often have quite a  bit of muscle relative to the bone structure, especially in the right places. 

  Look at this way Raptor, if you put on 10 pounds of muscle, and lose 10 pounds of fat, thats a 20 pound change in your body, which would most definitely HELP you right now.  The rate that you can truly build muscle at will allow your joints, tendons, etc. plenty of time to adapt as long as youre still doing athletic events.

 
  I dont know why you have that random number in your head though... Why not focus on building some muscle as you lean out a little, youre not at a place where this is hard to do right now.  The numbers will take care of themselves if you train and eat right.

  I think that some posterior chain hypertrophy would actually make you LESS likely to get hurt, as long as youre jumping enough while youre training and dont go overboard on calories.  The  body has a pretty damn efficient way of working those things out in your favor as long as you show it what youre going to be doing with this new strength/muscle.


<a href="http://www.youtube.com/watch?v=pNoXfLjoaEQ" target="_blank">http://www.youtube.com/watch?v=pNoXfLjoaEQ</a>

How much do you think he weighs?

  You would  be surprised at how small  boned and thin framed a lot of the most explosive athletes are, people always think they weigh much  more than they really do from the appearance. 

Muscle moves the skeleton around, and the heavier the skeleton, the more heavily muscled the athlete needs to  be to move those limbs well.  When you have a very light frame, with a decent amount of muscle hanging off your limbs, you can move those limbs FAST. 


 So with a thin frame, you have the advantage of even a small amount of added muscle tissue making a  bigger difference in locomotion.  However, you also have the disadvantage of added fat making a larger "relative" contribution as well, and one that will make you move much worse.





 

I mean - it probably would be better if I'd focus on losing weight and getting towards ~75 kg and then start on building up muscle from that point on.

Obviously I've said this over and over in the past year or so... and never kept word on it... never got my bodyweight under 82 kg... weaksauce by me.