Athletes use cupping to speed recovery, reduce muscle soreness, and improve flexibility between training sessions and competitions. The therapy gained mainstream attention during the 2016 Rio Olympics when Michael Phelps appeared on the pool deck covered in circular purple marks, but athletes across dozens of sports had been using it for years before that. The basic idea is simple: glass or silicone cups are placed on the skin, and a vacuum pulls the tissue upward, creating a decompression effect on the muscle and fascia beneath.
How Cupping Works on Muscle and Fascia
Most hands-on recovery tools, like foam rollers and massage guns, push into the tissue. Cupping does the opposite. The suction lifts the skin and the connective tissue (fascia) underneath, separating layers that may be stuck together after intense or repetitive exercise. This lifting action is thought to break up fibrous adhesions between layers of connective tissue and allow the fascia to move more freely.
The vacuum also increases blood flow to the area. Laser Doppler measurements show that cupping significantly boosts local skin blood flow, driven by changes in both metabolic and cardiac activity in the tissue. One study found that metabolic activity near the cupping site increased measurably, with larger cups producing a stronger effect. That increased circulation is the main reason athletes report feeling “loosened up” after a session. Research on the tissue under the cups has found that levels of lactate, pyruvate, glucose, and glycerin all rise in the surrounding area, suggesting the suction triggers a burst of metabolic activity in the subcutaneous tissue.
Pain Reduction and Faster Recovery
The biggest draw for athletes is relief from delayed onset muscle soreness, the deep ache that sets in 6 to 12 hours after a hard workout, peaks between 24 and 72 hours, and can linger for up to a week. A study published in Frontiers in Sports and Active Living tested cupping at various pressure levels on people with induced muscle soreness. Twenty-four hours after the soreness was triggered, the control group rated their pain at about 6.1 out of 10. The groups that received cupping scored dramatically lower, ranging from 4.7 down to 1.6, depending on how much suction was applied. Higher pressure produced greater relief.
The performance effects were measurable too. Athletes in the cupping groups recovered their 30-meter sprint times by 0.2 to 0.27 seconds within 24 hours after treatment, and their standing long jump distances improved by 4 to 8 centimeters compared to no treatment. For an athlete training twice a day or competing on consecutive days, that kind of accelerated recovery matters.
Flexibility and Range of Motion
Cupping also produces immediate gains in flexibility. A study testing moving cupping (where the cup is slid along the muscle rather than left in one place) found that 15 minutes of treatment increased hip range of motion by about 6 degrees, a 7% improvement. Knee flexibility improved by roughly 7 degrees, a 4% gain. These aren’t transformative numbers on their own, but for athletes working at the margins of their range, a few extra degrees in a hamstring or hip can mean the difference between a fluid stride and a compensatory movement pattern that leads to injury.
The Placebo Question
Not all the science is flattering. When researchers have tested cupping against a sham version (cups placed on the skin without real suction), results get murkier. A randomized placebo-controlled trial on people with knee osteoarthritis found that real cupping was no better than fake cupping for pain, function, or quality of life. The improvements people experienced appeared to come from the placebo effect, positive expectations about the treatment, and the simple therapeutic benefit of having a practitioner pay close attention to their body.
This doesn’t necessarily mean cupping is useless for athletes. The osteoarthritis study involved a chronic joint condition, not post-exercise muscle soreness, and the mechanisms may differ. But it does suggest that some of what athletes feel after cupping, the sense of relief and readiness, could be partly psychological. In elite sport, though, that distinction may not matter much. If an athlete feels recovered and performs better, the mechanism is somewhat beside the point. Many sports medicine practitioners treat cupping as one tool in a broader recovery toolkit rather than a standalone treatment.
What a Typical Session Looks Like
In professional athletic settings, cupping sessions generally last 5 to 10 minutes per area. The vacuum pressure typically falls between about negative 225 and negative 300 mmHg, which is enough to lift the tissue and increase blood flow without damaging it. Pressures beyond negative 375 mmHg are considered potentially harmful, and sessions longer than 10 minutes increase the risk of blistering.
Some practitioners leave the cups stationary (static cupping), while others glide them along the muscle with oil to cover a larger area (moving cupping). Athletes often receive cupping on the back, shoulders, hamstrings, and calves, wherever they carry the most training load. Sessions are typically done between workouts or the evening before competition, not immediately before performance.
Those Circular Marks
The distinctive round bruises are caused by capillaries breaking under the suction, drawing blood into the tissue beneath the skin. They look dramatic but are generally painless after the first day. Most marks fade within 3 to 7 days. Darker marks, which tend to appear over areas of chronic tightness, can take up to 10 days to fully resolve. Marks lasting longer than two weeks, or any that come with worsening pain, spreading redness, or blisters, warrant a check-in with a practitioner.
Athletes on blood thinners or medications that affect circulation may develop darker or longer-lasting marks. The bruising is superficial and doesn’t restrict training for most people, which is part of why cupping has become so popular compared to recovery methods that require more downtime.