How to Use the 100-Rep Method to Build Bigger Legs – Without Adding More Weight

One hundred reps might sound excessive, but according to veteran strength coach Christian Thibaudeau, the brutally simple protocol could help stimulate lower-body muscle growth beyond what standard training volume delivers.

Known as the ‘100-rep method’, the approach is exactly what it sounds like: performing 100 continuous reps with a relatively light load, often without re-racking the weight. While it may sound punishing, ultra-high-rep leg training has long been used by endurance athletes and bodybuilders alike.

The method involves completing 100 reps using a light weight. Thibaudeau recommends using the leg press or other lower-body machines rather than free weights. According to the coach, most people should begin with an unloaded machine before gradually increasing the load over time.

‘Use a very light weight,’ he writes in T Nation. ‘Try to do all 100 reps unbroken without having to rack the sled and rest.’

The aim is prolonged muscular fatigue and metabolic stress. Research suggests lighter loads taken close to failure can still stimulate hypertrophy. Thibaudeau also notes that the method may improve muscular endurance and recovery capacity by increasing blood flow to the muscles.

Despite the name, this isn’t something to perform every day. Thibaudeau warns that doing 100 reps before heavy squats could negatively affect performance, instead recommending it as a finisher at the end of lower-body sessions.

‘My favourite way of using it is at the end of lower-body workouts,’ he explains.

Because technique tends to deteriorate under extreme fatigue, machine-based exercises such as the leg press or hack squat are safer options than attempting ultra-high-rep barbell squats.

The 100-rep method probably won’t replace heavy lifting for building maximal strength any time soon, but it may provide an additional hypertrophy and endurance stimulus when used strategically. It’s also unlikely to suit beginners, anyone short on time, or lifters with poor recovery capacity.

It’s also worth noting that you don’t need to train at such high rep ranges to build muscle. Current evidence suggests a broad range of around 6-30 reps can effectively stimulate hypertrophy, provided sets are taken close to failure.

However, for experienced lifters looking to increase lower-body training volume, push their work capacity, or chase a serious quad pump, the 100-rep method could be an effective finisher.