「My child falls a lot, has poor handwriting, and struggles in P.E. — is it really not just laziness?」
Dyspraxia / Developmental Coordination Disorder (DCD) is a difficulty with motor planning — the child can move, but the brain can't efficiently plan and execute coordinated actions. It can look like "clumsiness" or "carelessness," but it's a neurological issue, not an attitude problem.
If you recognize 3 or more, it's worth exploring further.