buy a big and nice bike
Snowboard because its better than a dirt bike.
Upgrading will usually cost more than it will bring, but it all depends on what your current bike is, and what you want to do with it.
It depends how you are going to use the bike. If you are determined to use the bike for many years to keep yourself in shape, it would be a good investment to buy your own. If you just want to lost the baby-weight and stop using the exercise bike, it's better to join a gym.
ktm is way better than Yamaha........ the ktm 85 sx is probably the best bike in the world
All bikes are ok for normal people. Just buy what you are comfortable with.
You buy a better bike.. ventos suck and are hard to upgrade because of a backwards intake manifold. buy a cpi mako.
You buy it
honda is a better motorcross bike (250 and 450) and yamaha is a better trail bike
bike
You can buy a bike chain at a local bike shop, sporting goods store, or online retailer that sells bike parts.
A Trek Bike.
Saracen is a far better make Especially with their 2010 bike