This weekend's nationals will run for six days and double as a training camp for Ruddell's New Zealand ISA World Surfing Championship squad which will be trimmed down at the end of nationals.
Ruddell said nationals were part of the New Zealand squad's extended build up to the World Surfing Championship in Nicaragua (near Costa Rica) which will allow team management and selectors to assess the surfers closely before the final 24-strong travelling team is announced on April 23.
"That's [once the team gets trimmed] where we get a bit more serious with fitness testing and more focused coaching. What we said to all the guys was that you're in the team, bank on being in the team, and start fundraising now because it's not cheap to go on these campaigns.
"For New Zealand surfers to progress they need to be going to those harder competitions to put competitors up against them to give them a yard stick.
"It [the training camp] will be more us observing them and how they're going in terms of work ethic and things like that."
Ruddell, who also is a personal trainer at the Whangarei Aquatic Centre, expects to see how serious the Northland and New Zealand surfers have taken it by observing their actions.
"You know if they are [taking training seriously] if they are doing their warm up drills or are they goofing off."
Ruddell said the nationals will also provide an opportunity for himself and fellow Northlander and New Zealand junior manager Tony Baker, to observe team dynamics.
"It's a good way to get the team together ... we're travelling overseas as a tight group, sharing the same spaces so we need to operate as a team and if we've got personalities that clash then that's an important component for us to look at.
"At the end of the day though the best surfers will make the team but we still need to look at these things."
The World Junior Surfing Championships is an annual event having been held since 2003. New Zealand has competed at the event since its inception and placed 10th at the 2012 event in Panama.