Your not born to climbing greatness, you make your self better. Depending on the quality of your work, the quantity and then the rest, you should definitely get better, especially if you are rubbish.
The Rock Climbers Training manual is the latest training book and it does a great job although it has to be said there is alotta fluff in the way of flow charts diagrams and science. I hate the latter, you know science, 'cos basically there is none in climbing. Some of the best performers smoke dope and hang out, that's about all the science. Don't get me wrong this book is great and worth the price, but then so is Dave Mcleods book, they are worth reading and looking at, better would be to take notice of what they say and maybe go climbing and do some training. From what I can understand from the above book it basically recommends finger boarding, as do I, as does Mcleod and as does Eva Lopez. So get finger boarding.
This is the guide book to sport climbs in Malta and Gozo, and I just want to take this opportunity to remind people not to blindly trust bolts in situ, climbing gear belays, and indeed their own ability. All of these things can fail. In San Vito a belay failed resulting in a very unfortunate ground fall and a very proficient 8a rock climber being severely crushed. He was a guide also, I imagine he had the necessary experience to understand the danger of the situation. I have had many accidents, pegs breaking nuts pulling through rock, even dare I say it simple pumping out where I shouldnt and then plummeting, please be careful no one is immune.
Good boots mean good technique, or can mean good technique, always wear good shoes, and in my opinion slightly tight ones that promote careful precise pressing. The Rock Climbers Manual actually say this and its true. Sloppy shoes can and generally do mean sloppy technique.
This is the most important guide to my climbing as you can see, I am 74 kgs I can climb 8a / 8a + at this ponderous weight! If I lose 10 kg I will possibly lead several grades harder at 64kg I will still be BMI 20, some climbers are below BMI 17! Be careful if and when you loose weight, it can be physically and mentally dangerous.
There is some very helpful stuff in the Rock Climbers Manual about weight loss. In general there is much to recommend this book, but I will have to take exception to the advice about pull ups, having good pull up strength is a definite advantage, just ask Dimitri who places in the top three every time he goes out. There is also no yoga or sport specific stretching for climbing, this is perhaps an oversight.
Two books you should have are Performance Rock Climbing by Dale Goddard and Udo Neumann, and One Move too Many by Hochholzer and Voolker Schoeffl. If you put all the books in a bag and did 18 mm finger tip pull ups it would still get you up to 8b+, that and a bit of grass, just ask some of the best boulderers in the world.