HBE wrote:
I would advise at that age he should focus on speed development, running economy, sprint mechanics.
I would add volume very gradually.
Being efficient means being faster at shorter distances so you're more efficient and smoother at a longer less demanding speed. For instance having 21sec 200m speed will make 45/46 feel pretty smooth and then coming thru 50 in an 800 isn't is a breeze. By then an athlete of this caliber (1:44-46) has a solid volume base behind them.
I would also work on his strength with weights, plyos, core.
Lunges, squats, box jumps, hurdle mobility, bounding drills, etc
Most of this is very good advice. I'd just be careful about weights at 14. They need to be brought in very gradually, and probably not started till 15-16. By weights I mean cleans, dead lifts, squats etc.
At 14 he can certainly be doing circuit work, which might be what you mean. So calf bounces/skipping, hamstring bridges, squat holds (no weights), lunges, hurdles for mobility for sure, core routines etc.
I'd go light on the plyos too. Too much risk of severs, quads tendon, osgoods etc if you do too much of it. Short hills are good at that age too - bun on grass and don't run down them, only up. A bit of light plyos, but again not on hard surfaces, and with good supportive shoes.