A complete, exam-board-accurate work booklet and matching answer booklet for TA4 (Leading a Session) of OCR’s Cambridge National Sport Studies (J829), unit R185 - worth 14 of R185’s 80 marks. Unlike TA2, TA3 and TA5, TA4 is assessed through observed practical performance, not written coursework, so this booklet is built around that difference: the same six-stage KNOW IT - SEE IT - THINK ABOUT IT - APPLY IT - PERFORM IT - CHECK IT learning journey as the rest of the series, but with weaker-vs-stronger delivery comparisons in place of written model answers. Covers 4.1 Organisation of a Sports Activity Session (safe practice, timing, adaptability, reliability) and 4.2 Leading a Sports Activity Session (activity-specific detail, leadership style, communication, positioning, motivation, confidence, creativity). Includes OCR’s official four-strand MB1/MB2/MB3 mark bands quoted and explained in plain English, a weaker-vs-stronger delivery comparison table, a retrieval-challenge page, a two-scenario case study, a knowledge organiser and a glossary. The matching Answer Booklet gives teachers fully worked example answers for every self-reflection task. This is observed-performance support material, not exam revision - it cannot replace the live observation itself.