Build repeated high-speed running with the ball while keeping close control on the turns. Accelerate on the straights, decelerate and turn tightly at each cone, and keep the ball within playing distance throughout.
Mark a square about 12 to 15 yards a side with a cone at each corner. Players dribble the ball around the square at speed, taking a tight turn at each cone, for a set number of laps or time. Run it as a relay or a train with several players spaced around the square. Work then rest, and count laps or time each set.
Left to run alone, players settle into a pace that feels hard and is not. Solo conditioning has this problem universally: without a competitor, a clock or a coach, effort drifts down to whatever is uncomfortable enough to feel like work, which is usually well below the intensity that produces any adaptation.
A ball at the feet fixes part of that, and it is the honest case for a dribble circuit over plain running. The circuit has cones and corners, and a player cannot fake a turn. Either the ball is still under control coming out of it or it is not, and either the straight was covered quickly or the lap time says otherwise. The exercise supplies feedback that a lap of a pitch does not.
Technique changes with speed and should be coached explicitly, because players default to the opposite of what works. Big touches on the straights, since chasing a ball pushed ahead covers ground faster than a string of small ones. Then decelerate into the corner, shorten up, and turn tight off the correct foot. The instinct is small touches on the straights and a wide loop at the cone, which is slow in both places.
Attach a number. An eight-minute circuit with nothing recorded is an eight-minute jog with obstacles, and a lap target or a time turns it into something a player can try to beat.
Be clear what this is. Conditioning that keeps a ball involved, which is better than conditioning without one at this age, but the dribbling itself is not improving much at full speed.
Save it to your private drills, then change the animation, adjust positions, swap equipment, or drop it into a session block. Or start from a blank pitch and build your own.