My warmblood has just turned six and it's time to start his jumper training, he will be entering shows at 1.20m once he is ready and comfortable. However I'm concerned about his pasterns and whether they can take the strain of jumping?
Don't worry too much about the hind pasterns. It is the fronts that can be the issue. His look OK for angle and the like. No idea the horse tho.. his size and so forth.
Starting at 1.2 m is 3'6" and if that is the height you are going to regularly jump, you need a pretty good horse to stay sound. Hocks can be more of an issue behind than pasterns. These hocks look set under.....
It's hard to tell much from the photo. It would be great if you could get a photo of him standing square. I agree with Elana, hocks are more important than the pasterns for the back legs. Also, their knees and shoulders effect their ability to absorb concussion. A horse can have wonderful pasterns, but if his knees or shoulders aren't correct, then he may be just as, if not more prone to become lame (depending on the severity of their conformational fault)