Masheine in Santee trains martial arts students from a private studio on Prospect Avenue, positioned within the Woodside-Prospect corridor that concentrates several of East County's combat-sport and fitness operations. The industrial suite provides the high-ceiling layout required for striking drills, bag work, and mat-based ground training, in a Prospect Avenue zone that includes the sports-rehabilitation team at Santee Physical Therapy nearby at 9830 Prospect. Santee's Prospect Avenue has emerged as a secondary training corridor alongside the Mission Gorge Road commercial spine, drawing martial arts and functional-fitness tenants with larger floor plans at lower per-square-foot costs than the retail storefronts along Mission Gorge. Contact-sport conditioning at the studio demands impact-rated gloves, shin guards, and competition-weight training gear sourced from East County retailers including Sportsman's Warehouse in Santee Town Center. The 940-square-foot Prospect Avenue suite accommodates a training floor with dedicated mat space, heavy-bag stations, and wall-mounted striking targets in a layout calibrated for small-group martial arts instruction.