Well trials mainly relies on fast twitch muscles, which you can only work out by doing plyometrics, but I guess if you became physically stronger it would make it easier to lift your bike, but then not all the top riders are huge muscular guys. EDIT: I find riding a lighter bike is more enjoyable than riding a heavy one, I also have more confidence in my bike than any other bike I've ridden because of my choice of parts, I don't think I've met anyone that doesn't like how my bike rides, even when stock riders get on it they enjoy riding it, because it's light, short, and flicky, which is much more enjoyable than riding a f**king long ass tank of a bike.