Terminology clarification: 500 meter efforts are not jumps or sprints, that's a power effort. Still something that you definitely need to do, but a jump in training for a sprinter usually means an effort of around 100 meters, pure, all-out explosiveness, definitely an effort of less than 10 seconds. 500 meters is getting into long speed or sprint endurance territory, 25-30 seconds of work. By all means, you need to train this too, but this area is also necessary to train for the enduro people, so it's a bit of a cross-over area.