Work Smarter: Grow Huge Legs Without Heavy Weights (Feat. Thor)

Quick Overview

Hafþór Björnsson worked through a challenging leg hypertrophy workout, including bodyweight squats with an elevated heel and the Atlantis Assisted Glute-Ham Raise (GHR) with 180 lbs, guided by Dr. Mike Israetel and Jared, focusing on high reps and strict form despite feeling exhausted.

Key Points: Hafþór Björnsson performed the workout focusing on hypertrophy principles using lighter weight for high reps. The first exercise was bodyweight squats with an elevated heel for 3 sets of 15 reps, followed by 3 sets of 20 reps, emphasizing slow negatives and pausing at the bottom. The second exercise was the Atlantis Assisted GHR with 180 lbs for 4 sets, aiming for 20 reps total per set (20 reps in set 1, 20 reps total in set 2, etc., using rest-pause technique). The third exercise was the Atlantis 45-degree leg press, where Thor managed 7 reps on the first set with a very deep range of motion. Dr. Mike Israetel highlighted that the Bulgarian Split Squat is effective for quad development even without heavy weight, especially when the back knee is fully extended. Thor mentioned experiencing significant soreness in his hamstrings and glutes from the exercises. The session concluded with a discussion and Thor admitting he felt utterly destroyed by the high-rep, lighter-load training style.

Context: World's Strongest Man Hafþór Björnsson collaborated with RP Strength's Dr. Mike Israetel (PhD, Sport Physiology) and Jared (MS, Exercise Physiology, IFBB Pro) for a leg workout focused on hypertrophy rather than maximal strength. The session took place in a gym featuring modern black equipment, including Atlantis machines and a prominent RP logo on the wall.

Detailed Analysis

The video documents a leg training session between Hafþór Björnsson, Dr. Mike Israetel, and Jared, designed to build leg size using hypertrophy principles instead of maximal strength loads. The session began with bodyweight squats using an elevated heel platform (00:00). Dr. Mike coached Thor to perform slow negatives, pause fully at the bottom, and push his knees forward, aiming for 50 total reps across three sets (09:09, 13:14). Following the squats, they moved to the Atlantis Assisted Glute-Ham Raise (GHR) using 180 lbs. Thor performed 4 sets, aiming for 20 reps total per set using rest-pause techniques, successfully completing 8 reps in the first set and pushing hard for the remaining reps (00:55, 02:21). Dr. Mike explained that this machine is excellent for hitting the glutes and stretching the hamstrings deeply, which is often missed in other exercises (03:47, 04:05). The next exercise was the Atlantis 45-degree leg press, where Thor managed only 7 reps on the first set due to the intensity (07:54). Finally, they performed Bulgarian Split Squats using only bodyweight, focusing on depth and feeling the stretch in the front glute (16:01). Dr. Mike emphasized that for Thor, bodyweight squats are equivalent to lifting hundreds of pounds, and the focus was on achieving a deep stretch and controlled movement (12:04, 13:35). After the grueling session, Thor admitted to feeling completely destroyed and in pain, especially in his hamstrings and glutes (05:37, 09:28, 22:28).