The disclosure provides a modular sports training system that can be assembled, placed on a supporting surface, and stood upon by a person during sports training activities. The system is adapted to be assembled with one module being disposed at a non-parallel angle to another module. The non-parallel angle allows a person standing on the system to place one foot on one module and another foot on another module at the non-parallel angle, such as in a batter's stance, and allows the person to stand in a stable manner while encouraging certain positioning of the feet during the sports training activities. The modules can be coupled by an interlocking protrusion and receiver arrangement. The modules can be coupled together by inserting a protrusion of one module into a receiver of another module when the modules are unaligned relative to each other; and then twisting the modules into alignment.