The first three shots in doubles are not isolated actions. The serve limits the return, the return contests initiative, and the third shot decides whether that advantage continues.
BadminSense shows that a standard smartwatch can identify parts of a badminton stroke, but it remains a research prototype. Data can support feedback; it cannot replace coaching judgement or court validation.
Age bands, training hours, and “professional coaching” do not prove camp quality. Ask how players are grouped, what they will learn, how feedback works, and whether progress survives the week.