Prime the body to sprint: react quickly, accelerate to top speed with good mechanics, and decelerate and change direction under control.
After the mobility warm-up, line the group up and use a call, a clap or a colour, as the trigger. On the cue they accelerate to the far cones, decelerate under control, then turn and sprint back. Build from about seventy percent up to full pace over four or five reps. Vary the trigger and the start position (facing, side-on, sitting) to sharpen the reaction. Keep recoveries full so every rep is quality.
Fork it into your private drills, then change the animation, adjust positions, swap equipment, or drop it into a session block.