My nearly 12yo exercises a lot, he swims for an hour twice a week (fast), he's done triathlon training weekly since he was 8 and completed several races. He cycles 3 miles a day as that's how he gets to school. We go for a 5k run/walk every weekend as a family.
Over the last year he's really struggled with running. GP prescribed an inhaler "in case that was it" but he never struggles with swimming or cycling and his lungs volume test thing was normal so I'm not sure it's respiratory or fitness related.
Today he did his first "bleep test" at school and scored 4.5 which is 'poor' apparently. He says he was one of the first to drop out and that he was exhausted. He is really disappointed as he used to consider himself very sporty but has now lost confidence in all but swimming. He quit triathlon over the summer because he was finding it too hard to keep up, but he thought in his year as a whole he'd still be average at least.
I think he needs to go back to GP but I don't know what to ask really. Has anyone had this?