Accommodating Resistance: Do Bands and Chains Really Match the Squat and Bench Strength Curve?

Accommodating resistance means attaching chains or elastic bands to a barbell so the load rises as you get closer to lockout (part of our maximal strength and powerlifting guide). It is built around the idea that you are usually stronger at the top of a squat or bench than at the bottom, so a plain barbell is too easy at the end and too hard at the start. Whether that turns into a bigger max is less clear, and that is what this article sorts out. It also complements our piece on matching resistance profiles to human strength curves.

Short version: the research supports bands and chains as a way to move the bar faster and produce more power in the session. It does not clearly show that they build more strength than normal training.

What is accommodating resistance and why use it?

A barbell weighs the same at every point of the rep. Your joint angles and muscle force do not stay the same. In a squat, the bottom is where the hips and knees are in the weakest position and the top is where you can push hardest. The bench has a similar story, with a sticking region partway up and an easier lockout.

So on a plain barbell, you pick a load you can grind through the hard part, and the easy part is undersold. If you try to move the bar fast, you may also be decelerating near the top, because there is no reason to keep pushing once the hard bit is over.

Accommodating resistance changes that. As the bar rises, chain links leave the floor, or a band attached to the rack base stretches further. Either way, the lifter pushes against a heavier bar near lockout.

This approach is closely tied to the Westside Barbell system associated with Louie Simmons, which pairs heavy max effort work with lighter dynamic effort days using bands and chains. The coaching logic is plausible. The research, as you will see, is more mixed than gym lore suggests.

How do bands and chains actually differ?

They both make the bar heavier near the top, but they feel different.

Chains are steady. Each link that leaves the floor adds a little weight, so the load ramps up in a fairly smooth way. At the bottom of a squat, part of the chain is resting on the floor and does not count.

Bands behave like springs. The further they stretch, the harder they pull. They can also add downward pull on the way down, so the bar can come down faster than you expect, which affects control in the lowering phase.

A 2026 lab study of 15 men back squatting with chains, elastic bands and free weights found real differences. Peak ground reaction force was greater with plain free weights than with either variable resistance setup, but concentric rate of force development was greater with chains than with free weights. Joint velocities were mostly faster with variable resistance, and free weights produced greater hip and lumbar spine moments. The authors suggested chains may be preferable for power adaptation, and bands may suit lifters prone to lumbar problems, because they stimulate the legs while lowering spinal loading (Alves et al., 2026). That was a small acute study in men, so treat it as a hint, not a rule.

Does accommodating resistance build explosive power?

In the session itself, it often does. A 2022 meta-analysis pooled 16 crossover studies with 207 participants. Variable resistance produced greater mean velocity (SMD 0.675, moderate-quality evidence) and greater mean power (SMD 1.022, low-quality evidence) than constant resistance. Subgroup analysis found the clearest gains in mean velocity and mean power when the total load was equated. However, when the variable setup was the heavier one, peak velocity was marginally reduced. The meta-regression also found that peak velocity, peak power and rate of force development were positively moderated by the use of elastic bands (Shi et al., 2022).

Individual studies agree in direction. Ten men squatting with elastic bands produced greater power and velocity in both the acceleration and deceleration phases, although force during acceleration was lower than with free weights (Kubo et al., 2018). In eight trained rugby players, chains at 15% of 1RM on top of a 30% constant load gave likely greater mean bar velocity and bar acceleration in a bench throw than a constant 45% load, though peak and mean power differences were trivial or unclear (Godwin et al., 2018).

There is also a warm-up angle. In 15 strength-trained men, a set of three trap bar deadlifts at 80% of 1RM with about 15% of 1RM in band tension improved a squat jump 90 seconds later, while the same lift with free weights alone did not (effect size 0.34) (Masel et al., 2024). That is a one-off acute effect in a small group. If you want the wider picture on that topic, see our article on post-activation performance potentiation.

Does it build more maximal strength? The studies disagree

This is the part where the story gets uncomfortable for the gym lore.

Studies finding a benefit. In a 7-week trial of 44 resistance-trained athletes, those who added elastic resistance to back squat and bench press gained 16.47 kg on the squat versus 6.84 kg for the control group, and 6.68 kg versus 3.34 kg on the bench, with larger average power gains too (Anderson et al., 2008). A 2022 meta-analysis of 14 studies reported higher maximal strength with variable resistance (ES 0.80 overall, 0.57 in trained subjects). In trained subjects the advantage appeared when the load was 80% of 1RM or more, and not below that (Lin et al., 2022). A 2026 meta-analysis found long-term advantages for maximal strength and jump distance (SMD 0.28 to 0.37), especially with chains or a variable-load share of 20% or less (Li et al., 2026).

Studies finding no difference. A different 2022 meta-analysis of 17 studies and 491 adults aged 18-37 found no significant difference between variable and traditional training for lower-body strength (SMD -0.10) or upper-body strength (SMD -0.17), and none for muscle power either (Andersen et al., 2022). In 19 women athletes, bench press with chains at 5% of the load gained 17.4% versus 11.8% for traditional training over 16 sessions, but the difference was not statistically significant (Burnham et al., 2010). And in 19 strength-trained women over 7 weeks, accommodating resistance improved Wingate peak power but not 1RM compared with traditional training (Parten et al., 2023).

Why might they differ? The meta-analyses did not use the same sets of studies, definitions or outcome measures. Training periods are short, often 6-8 weeks. Participants differ in training status, and the amount of variable load, the equipment, the exercise and the way total load was matched all vary. Several of the positive trials are also small.

A cautious takeaway. Accommodating resistance is unlikely to hurt, and it may give a modest edge in power or in max strength for some experienced lifters. It is not a proven shortcut. If your plain-barbell training is progressing, you do not need it.

How to use bands and chains in your training

The coaching question is where it fits, and the answer is on lighter, faster work.

Choose a purpose. If your goal is rate of force development or bar speed, use it on a dynamic effort day. Our article on rate of force development and explosive training covers the bigger picture of that quality. For the intent side, see moving the bar with explosive intent.

Keep the accommodating share modest. The 2026 meta-analysis found long-term advantages with a variable-load share of 20% or less. Acutely, a share above 20% gave higher force output, while above 37% lower velocity and power than free weights (Li et al., 2026). One older clean pull study (six teenage female weightlifters) found adding elastic tubing at 10% of 90% 1RM gave the best increase in power, force and velocity (Paditsaeree et al., 2016). A reasonable starting point is about 10-20% of the bar’s total load coming from the chain or band.

Do not match the bottom load too heavily. In resistance-trained men benching at 85% of 1RM, chains matched to the resistance at the bottom produced lower peak velocities and longer lifting times than the conventional lift. Muscle activation changed mainly in the lowering phase (van den Tillaar et al., 2022). In plain terms, if you stack too much chain on top of a heavy bar, you slow the very thing you were trying to speed up.

For the squat, lifters can see the exercise in practice below.

Setup basics.

• Use a power rack with safeties set below the bottom of your squat or bench.
• Anchor bands firmly to the base of the rack or a heavy fixture, and inspect them for nicks.
• Hang chains on loops or smaller chains over the sleeve so they are centred and do not swing.
• Unrack with the extra load on and take a few lighter warm-up sets, because the bar behaves differently.

If you also train legs separately, our free leg day plan shows where heavy squat work usually sits in a week.

What are the common mistakes?

• Going too heavy with the accommodating piece. Very high variable-load shares reduced velocity and power in the 2026 meta-analysis.
• Expecting it to fix a sticking point. The studies measure bar speed, power and strength, not whether one weak range improved. For that problem, see sticking point analysis for squat, bench and deadlift.
• Skipping safety. Bands can slip and chains swing. A rack with safeties matters more here than normally.
• Turning every session into a gimmick. If your plain-barbell numbers are not climbing, check your sets, sleep and food first.

Who should (and should not) bother?

It makes the most sense for lifters who already have a few years of consistent training, a stable technique and a plateau, or for athletes who care about speed and power. Beginners progress fast on a plain bar and gain little from the extra complexity.

If you only want bigger muscles, there is no evidence in the studies reviewed here that accommodating resistance beats standard training for hypertrophy, because they did not measure it. Standard sets near failure remain the default.

For lifters in India training in a commercial gym, chains and bands may not be available, and they are not essential. Paused reps, controlled tempo and moving the bar with intent cover most of the same training purpose at no cost.

When to see a doctor

Variable resistance changes the bar path and loading pattern. If you get sharp pain in your shoulder, lower back or knee, numbness, or pain that lingers for days, stop and get checked by a doctor or physiotherapist. Do not train through pain that changes how you move. This article is education, not medical advice.

Frequently asked questions

The questions people ask most are in the FAQ section below. If you want a structured way to fit speed work into your week, our free training plans are a good place to start, and the maximal strength guide shows how the pieces fit together.