Start with Fix Bad Posture in 22 Days (BETTER POSTURE GUARANTEED!) (14 min, ATHLEAN-X), then How to Fix Plantar Fasciitis (FOREVER!) (14 min, ATHLEAN-X). All 84 lessons here are free, from the teachers' own official uploads. You'll need adjustable dumbbells, resistance band set, body fat calipers and a few more basics (about $465 of kit). The book to keep beside you: NASM Essentials of Personal Fitness Training by National Academy of Sports Medicine.