Squats!
The King of lifts, squats, stimulates the whole leg and is great for testostorone production in men. Coach has always had a love-hate relationship with them. But since he used to compete, he knows the importance of doing them and for leg growth! Yup he likes training with chains also, as they add great resistance.
And yes, he uses chains in his workouts and coaching in person at his garage gym :)