Plan training by growth period
The Long-Term Athletic Development (LTAD) model organizes training content by biological maturity, not chronological age. Calculate your child’s stage and weekly training framework.
Frequently asked questions
What is PHV and why does it matter so much?
PHV (Peak Height Velocity) is the period when height growth peaks; on average ~11.8 years in girls and ~13.8 in boys. Injury risk rises during this period and training content should be adjusted accordingly.
Is the result reliable if I don't know the growth velocity?
Age alone gives a rough estimate; children of the same age can differ by 3-4 years biologically. Keep regular height records (via the profile page) and add growth velocity; the estimate improves markedly.
What if the LTAD stage conflicts with my coach's programme?
This tool doesn't replace the coach; it provides a common language. Share the stage output with your coach — especially the load-management cautions during the growth spurt.
Is my late-developing child at a disadvantage?
They may look smaller than peers short-term, but research shows late developers are often advantaged in technical skill and long-term potential. Bio-banding exists precisely to restore this fairness.
Clinical references
Balyi & Hamilton 2004 (LTAD), Lloyd & Oliver 2012 (YPD model), Mirwald et al. 2002 (PHV), Cumming et al. 2017 (bio-banding). Not a substitute for individual assessment.