Yoga generally produces greater passive flexibility, meaning your ability to sink deeper into a stretch and hold it. Pilates tends to build better active flexibility, meaning your muscles can move through a wider range of motion while under load. Which one is “better” depends on what kind of flexibility you actually need and what your body is starting with.
How Yoga Increases Flexibility
Yoga relies heavily on static stretching, where you hold a position for an extended period. When you hold a low-force stretch for more than about seven seconds, tension sensors in your muscles called Golgi tendon organs kick in and temporarily tell the muscle to relax. This process, called autogenic inhibition, reduces the protective tension that normally limits how far a muscle can lengthen. The result is that you can gradually sink deeper into a pose the longer you hold it.
This mechanism is why yoga feels like it “unlocks” tight areas over time. Each session trains your nervous system to tolerate a greater range of motion in a relaxed state. Styles like yin yoga, where poses are held for three to five minutes, push this even further by targeting the connective tissue around joints. For someone whose primary goal is touching their toes, doing full splits, or simply feeling less stiff, yoga’s approach to flexibility is hard to beat.
There’s a tradeoff, though. The flexibility you gain in yoga is largely passive. You can achieve a deep stretch when gravity or your body weight pulls you into it, but that doesn’t always translate to flexibility you can use while running, lifting, or playing sports. Your muscles learn to lengthen, but they aren’t necessarily stronger at those new end ranges.
How Pilates Increases Flexibility
Pilates takes a different route. Instead of holding long stretches, it builds flexibility through eccentric contractions, where a muscle lengthens while it’s actively working against resistance. Think of slowly lowering your leg during a leg circle or controlling the carriage on a reformer as it slides away from you. The muscle is stretching and contracting at the same time.
A research review in the British Journal of Sports Medicine found that eccentric training effectively increases flexibility in the lower body. Another study in the North American Journal of Sports Physical Therapy found that moving through a full range of motion during eccentric contractions doubled hamstring flexibility compared to static stretching alone. That’s a striking result, and it highlights why Pilates can be so effective even though it includes very few held stretches.
Because Pilates requires you to stabilize your core before moving your arms or legs through their range of motion, the flexibility you develop comes with built-in strength and control. This is what trainers call “functional” flexibility. Your body learns to access new ranges of motion while maintaining stability, which is more useful for everyday movement and athletic performance.
Reformer Pilates vs. Mat Work
If you choose Pilates specifically for flexibility, the type matters. A 2025 study found that reformer Pilates was more effective at improving flexibility than mat Pilates in soccer players. The reformer’s adjustable springs provide resistance that forces muscles to work eccentrically through longer ranges of motion, while the straps can gently pull limbs into deeper stretches than bodyweight alone allows. Mat Pilates still improves flexibility, but the reformer gives your muscles more to work against, which amplifies the eccentric training effect.
Which Is Safer for Your Joints
For most people, both yoga and Pilates are low-risk activities. But if you’re naturally very flexible or have joint hypermobility, yoga carries a specific concern. People with loose joints can easily sink past the point where muscles are doing the work and start loading their ligaments and tendons instead. This feels like you’re “good” at yoga because you can fold deeply into poses, but you may actually be straining structures that shouldn’t be bearing that load. Slower, gentler styles like yin yoga can be particularly problematic for hypermobile individuals, since sustained holds let the body settle into positions that overstretch connective tissue.
Pilates is generally considered safer for hypermobile joints because it emphasizes building muscle strength around the joint rather than pushing past existing range of motion. Rheumatologists and physical therapists frequently recommend Pilates over yoga for patients with connective tissue disorders. Reformer Pilates in particular is often preferred because it’s lower impact than mat work and gives you more external support. That said, even Pilates requires modification for hypermobile people, especially moves that involve bearing weight at fully extended positions.
If you’re not hypermobile and just want to get more limber, injury risk in either practice is low as long as you avoid forcing positions your body isn’t ready for.
How Long Until You Notice a Difference
With consistent practice (two to three sessions per week), most people notice flexibility improvements within four to six weeks in either discipline. Early gains come quickly because your nervous system is adapting. It’s learning to tolerate greater stretch before triggering a protective contraction. Structural changes in the muscle and connective tissue take longer, typically showing up after two to three months of regular training.
Yoga may produce faster visible results in passive flexibility simply because each session dedicates more time to deep stretching. Pilates gains show up more in how you move: reaching further during activities, feeling less restricted during exercise, or noticing that a squat or lunge feels easier at the bottom.
Choosing Based on Your Goals
- Maximum passive range of motion (splits, deep backbends, general looseness): Yoga is the more direct path. It dedicates more of each session to sustained stretching and targets the nervous system’s tolerance for lengthened positions.
- Functional flexibility with strength (moving better in sports, reducing stiffness during daily activities, preventing injury): Pilates builds flexibility you can actually control, because your muscles are strong through the ranges you’re gaining.
- Joint hypermobility or injury history: Pilates, particularly reformer Pilates, is the safer starting point. Build strength around your joints before adding passive flexibility work.
- General stiffness with no specific goal: Either will help significantly. The one you enjoy enough to do three times a week will give you better results than the “optimal” choice you skip.
Many people find the best results come from combining both. A base of Pilates builds the core stability and eccentric strength that makes yoga poses safer and more controlled, while yoga’s sustained stretching pushes passive range of motion further than Pilates alone. If you have time for only one, let your specific goal guide the decision rather than looking for a universal winner.