Density Hangs: What They Are and Do They Work

Density hangs are long hangs, about 20 to 40 seconds, on an edge small enough that you reach failure in that window. Coach Tyler Nelson proposes them to thicken tendons. Evidence level: low. No trial in climbers has tested them, so use them as a small add-on, not as your main strength work.

What are density hangs?

A density hang is a two-arm hang of roughly 20 to 40 seconds, taken to muscular failure. Tyler Nelson of Camp4 Human Performance describes them in his “simplest” finger program (coach source, secondary). The intensity comes from the edge, not from added weight: a jug or a large pocket for beginners, a 10 to 15 mm edge for experts. Nelson suggests two days a week for beginners and three for experts, at least 4 to 6 hours away from climbing; he gives no sets or rest times.

How do you do density hangs?

Do them after a proper warm-up. Sets, rest and frequency below are our suggestion, not Nelson’s.

Parameter	Setting
Grip	Open hand or half crimp, same every session
Edge	Chosen so failure comes at 20 to 40 s; larger if you drop before 20 s
Hang	Two arms, to failure (Nelson); keep the shoulders engaged, and step off before your grip opens
Sets	2 to 3
Rest	3 minutes, as for max hangs
Frequency	2 sessions a week, at least 48 hours apart (Nelson gives 2 to 3 days a week)
Progression	Hang longer on the same edge; once 30 seconds feels easy, take the next smaller edge
Block	4 to 6 weeks, then retest your maximum

A long hang to failure still loads the pulleys, so count it with your climbing and hard finger days. Stop at a sharp pain, a pop, or pain at the base of a finger that is still there the next day.

Do density hangs thicken your tendons?

Nobody has shown it in climbers. Nelson’s explanation is that long, slow loading makes tendon fibres slide and break old bonds, and that rest and food then let denser bonds form. In a separate section on blood flow, he adds that efforts above roughly 30 to 50% can compress the forearm’s blood vessels, which may improve oxygen use over time; he does not tie that directly to density hangs.

The closest research is not on fingers. In a 2001 study, eight young men trained each leg with a different isometric protocol at 70% of maximum: 1-second contractions on one leg, 20-second contractions on the other, with the same total volume. Both legs gained about 32 to 34% in strength, but tendon stiffness rose only with the long contractions. That is a small study on the thigh, and stiffness is not density or injury resistance.

How do they compare with max hangs and repeaters?

	Max hangs	Repeaters	Density hangs
Hang	About 10 s	7 s on, 3 s off, 6 reps	20 to 40 s, one go
Load	Near maximal	60 to 80% of max	Moderate, to failure
Main target	Maximal strength	Endurance, some strength	Tendon (theory), local endurance
Evidence in climbers	Several trials	Several trials	None direct

For strength, they probably do less than heavy work, though this is our reading, not a tested result. In a 4-week trial of 54 climbers, maximal 6-second pulls raised finger strength by 14.3% and hangs at 80% of maximum by 12.4%; nobody has tested a 30-second hang to failure against these. Max hangs and repeaters cover the two tested protocols. For daily, gentler tendon work, see daily low-intensity hangs.

Who should not do density hangs?

Climbers with finger, pulley or tendon pain. Pain stops the session; if it persists, see a physiotherapist.
Beginners with under a year or two of regular climbing: climbing itself is enough load.
Anyone still growing. Young climbers should hangboard only with a coach or sports physician.
Anyone returning from a finger injury, unless a physiotherapist set the loads.

Do this in Entralpi

Density hangs depend on picking the right edge, and a hang to failure hides how much force you still hold. In the app, the max strength test measures your maximum; keep it with one tap at the end of the test, or type it in Settings (Profile, then Settings, under Physical Profile, Max strength), then follow a plan or build your own workout with long holds at a share of that maximum. Without the plate, the timer counts the hang for you.

Sources

Nelson T. The “Simplest” Finger Training Program for Climbers. Camp4 Human Performance (coach source, secondary; cites reviews by Oranchuk, Kubo, and Lum and Barbosa without tying them to density hangs).
Kubo K, Kanehisa H, Fukunaga T (2001). Effects of different duration isometric contractions on tendon elasticity in human quadriceps muscles. Journal of Physiology, 536(2).
Devise M, et al. (2022). Effects of different hangboard training intensities on finger grip strength, stamina, and endurance. Frontiers in Sports and Active Living.