Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good video for freestyle and backstroke drills

Shows step by step drills in progression to improve freestyle and backstroke. Contents similar to TI videos (Glen Mills was formerly associated with Terry) although called by slightly different terms but quality is better. Drills are extremely useful for improving balance, alignment and "feel" of water. I've been practising it regularly and even recommended them for my students. Insructional as well as viewable repeatedly.