During World War I, a Russian soldier named Alexander Zass got captured by the Austrians. Then he escaped. Then he got captured again. Four times total, and he got out every single time.
At least one of those escapes involved snapping his chains and bending the bars of his cell. Later accounts say he kept training in captivity by pushing and pulling against his cell bars and chains, metal that wasn’t going anywhere.
He was a small man, about 5’5″ and around 155 pounds by the account of the weightlifter who tested him. After the war he toured as “The Amazing Samson,” bent iron bars into U shapes on stage, and carried a grand piano with a pianist and a dancer sitting on it. W.A. Pullum, the champion weightlifter who wrote the foreword to his book and tested him in person, summed up the method in one line: “The keystone of the Samson system is the development of the strength of the tendons.”
A hundred years later, most guys still train like tendons don’t exist. Then their elbow files a complaint.
Your Muscles Are Lying To You
Muscle adapts fast. You train hard for a few weeks and you’re stronger. You can feel it.
Tendon is the cable that carries that force to your hand, and it’s on a completely different schedule. Tendon training studies usually show measurable changes in stiffness after two to three months of heavy loading, long after your muscles feel stronger. Tendons also have a poor blood supply compared to muscle, which is part of why they’re so slow to build and so slow to heal.
So here’s what happens. A guy who deadlifts big starts bending. He folds a 230 in week one, feels like a god, jumps two levels in a month. His muscles can make the force. His tendons haven’t had time to catch up. Week six, the inside of his elbow is screaming and he’s on the couch with a bag of frozen peas.
He didn’t get weaker. He got impatient.
Stop Moving Up On Your Muscle’s Schedule
Move up when the bar gets boring. Not when you bend it once on a good day. Simple rule: clean-bend your current bar two out of three tries, then move up. Some levels you’ll clear in a couple weeks. Some, like the 330, can hold you for two or three months. That’s not a plateau, that’s your tendons doing their homework.
Don’t skip levels. The ladder climbs one known step at a time on purpose. Skipping one means handing your tendon a jump it never agreed to.
Pull On A Bar You Can’t Bend
This is the Zass move, and it’s the most direct tendon builder you’ve got.
Grab a bar a level or two above your best. Wrap it, set your hands exactly like you would for a real attempt, right at the kink.
Pull hard for 6 to 10 seconds. It’s not going to move. That’s the whole point. You get max tension through the tendon without the joint having to survive a fold, and nothing can go sideways on you.
Three to five pulls, full rest between. Breathe, shake it out, go again.
Nobody does this because there’s no bent bar at the end. No photo, no trophy, nothing to post. Which is exactly why the guy grinding on the immovable bar in the corner ends up folding stuff that humbles everybody else.
Keep Hard Sessions Short
Dr. Keith Baar at UC Davis studies how tendons respond to exercise. His finding: about 10 minutes of loading is enough to give a tendon the signal to adapt. After that, the cells stop responding to more work for a while. His research points to roughly six to eight hours before another bout does much.
Translation: the two-hour garage marathon with eighty hard bends isn’t building more tendon. After the first ten minutes or so, you’re mostly piling up wear.
Set a timer. Ten minutes of focused, heavy tendon work, the isometric pulls and your real attempts. When it goes off, you’re done with the heavy stuff.
Space your hard days. Two or three heavy sessions a week is plenty. The days between aren’t wasted, they’re when the building actually happens.
Feed It Easy Work On The Off Days
Off days aren’t for nothing. Easy, smooth, repeated movement keeps the area moving without adding real strain.
Bend a stack of easy bars. Stuff well below your max, clean form, nothing that makes you grunt. You’re moving, not testing yourself.
Or hit a rice bucket. Five to ten minutes of digging, twisting, opening and closing your hands. Looks like nothing. Feels like nothing. Works.
The Collagen Thing
In a 2017 study out of Baar’s lab, guys who took 15 grams of gelatin with some vitamin C about an hour before a short bout of exercise showed roughly double the collagen-building markers in their blood compared to placebo.
That’s a blood marker in a small study, not a promise that your elbows turn into rebar. But it’s cheap, it’s food, and if you’re going to try it, the timing is the part that matters. About an hour before your heavy session.
Where Calibrated Steel Comes In
Everything above depends on one thing: knowing exactly how hard you’re pushing.
Hardware store steel won’t tell you. Two nails from the same box can be wildly different, so you think you’re taking a small step and you’re actually taking a huge one on tissue that isn’t ready.
A calibrated bar is rated by the exact force it takes to bend it. Twelve levels, 190 LBS up to 1,110 LBS. You always know what you’re asking your tendons to handle, and you can pick the bar one level up for your isometric pulls without guessing.
Zass built a whole system around the tendons. You can do it on a bar with a known rating.
Starter kit’s $9.99 with free shipping. Nine bars (190, 230 and 280 LBS), nylon wraps, and the intro booklet.
Frequently Asked Questions
How long until my tendons actually get stronger? Figure around three months of consistent, sensible loading before the real changes show up. Your muscles will feel ready long before that. Don’t listen to them.
Can I bend every day? Easy volume, sure. Heavy attempts, no. Keep the hard stuff to two or three short sessions a week.
How hard should the isometric pulls be? Hard, but controlled. Build into the pull over a second or two instead of yanking. Yanking is how things tear.
Do I need collagen or gelatin? No. Loading builds tendon, supplements don’t. At best it’s a small helper if you time it right.
What if my elbow already hurts? Then you’re in rehab, not building. Read our golfer’s elbow article and fix that first.
Why does my forearm feel strong but my elbow aches? Because your muscle adapted and your tendon didn’t. Slow down your jumps between bars and let the tendon catch up.