This generally means a short wingspan with an extra-strong wing spar structure (to take the lift and G loads), a wing with either high-lift devices that deploy in the turn or a relatively thick wing profile, no fuel tanks or excess mass in the wing itself (to minimize the axial moment of inertia of the airframe), big ailerons (to generate a large rolling moment), boosted controls (so a human is capable of working those big control surfaces) and a big engine (to maintain altitude & airspeed during the turn).
You'll find most of these design features in an aerobatic plane or a fighter, whose "design opposite" would be a high-performance cross-country competition sailplane.