Strong, powerful legs are a key component of both athletic dominance and a symmetrical physique. Yet, so many guys go through the motions on autopilot or even skip leg day altogether, and the only explanation is that they don’t want to do the hard work.

Tom Platz and Branch Warren have some of the best sets of wheels to ever grace the bodybuilding stage, and what do they have in common? They’re two of the hardest-working bodybuilders of all time.

For a leg-training workout to be productive, it has to be an intense session—except for a few genetic anomalies, there’s no way around it if you want to build serious size. Your legs are made up of the largest muscles in your body, and you have to work them hard. Case in point: Eight-time Mr. Olympia Ronnie Coleman repped out 800-pound squats in his prime.

But there’s more to building gargantuan legs than just throwing tons of weight around. Strength is great, but you also need to have endurance. Everywhere you walk, bike, or play, you use your legs, so it’s a good idea to incorporate higher-volume training into your legs routines.

In the following slides, we take a look at seven exercises to work your legs to total exhaustion.