Buoyancy shorts occupy a useful middle ground in swim training. They are not a wetsuit, and they are not a substitute for learning how to hold yourself in the water. They are a training tool that changes body position on purpose, which makes them especially valuable for triathletes and open water swimmers who spend most of their week in a pool but race in very different conditions.
That mismatch is easy to overlook. Pool training rewards repetition, pace control, and clean walls. Open water adds sighting, contact, variable rhythm, and, in many races, the support of a wetsuit. A swimmer can be fit enough for the distance and still waste energy every length because the hips ride low and the stroke works too hard to compensate. Buoyancy shorts help address that exact problem.
Blue70’s LIFT Buoyancy Short, launched in 2020, was built for swimmers who need more than an easy set. It was the first buoyancy short in the line built with NBR foam. The point is not to promise outcomes. The point is to give swimmers a repeatable way to feel a better line in the water, then train from that position with intention.
Why buoyancy shorts matter
Most swim faults do not stay isolated. One error usually creates the next.
A swimmer lets the legs sink. That adds drag. The added drag raises effort. As effort rises, the front of the stroke shortens, breathing gets hurried, and the kick starts working harder to rescue body position. By the time that swimmer reaches the back half of a long repeat, the stroke can feel like a series of corrections instead of one connected movement.
Buoyancy shorts change that chain reaction by lifting the hips and upper legs. When the body sits flatter in the water, several things often improve at once:
- the head stays quieter
- the kick becomes less frantic
- rotation feels smoother
- the catch starts from a more stable position
- breathing becomes easier to organize
Those changes do not happen because the shorts fix the stroke. They happen because the swimmer starts from a better position.
Why triathletes tend to feel the benefit early
Triathletes often arrive in swimming with solid aerobic fitness and uneven water balance. They can work hard, but hard work in the wrong position still costs too much. That is why buoyancy shorts tend to make immediate sense for this group.
When a triathlete with low hips puts on buoyancy shorts, the first change is usually not speed. It is relief. The stroke stops fighting the water quite so much. That gives the swimmer room to notice timing, breathing, and front-end pressure instead of spending the whole repeat trying to stay on top of the water.
For a newer swimmer, that feeling can help connect technique cues to something physical and memorable. For a more experienced age-grouper, it can preserve form later in the session, when fatigue would otherwise pull the body line apart.
Buoyancy shorts can help, but they can also hide things
This is the part worth saying plainly. A good training tool can still become a bad habit.
If you wear buoyancy shorts in every meaningful session, they can cover up the reason your position falls apart without them. The water feels cleaner, the repeat feels easier, and the feedback can fool you into thinking propulsion improved when the main change was reduced drag.
That is why buoyancy shorts work best when they create contrast. You want to feel the supported position, then remove the shorts and see how much of that shape you can hold on your own. Without that second step, the lesson stays attached to the equipment.
Why material choice matters
Buoyancy training only works if the support feels stable and swim-specific. Lift that is too little, too much, or poorly placed changes the stroke for the wrong reasons. A swimmer should still be able to rotate naturally, hold rhythm, and connect the kick to the rest of the stroke.
The Blue70 LIFT Buoyancy Short uses NBR foam, and that matters because consistency of support is central to useful feedback. The shorts are meant to support position through the hips and thighs while leaving the athlete free to focus on the details that matter in real swimming: head control, pressure through the catch, body roll, and breath timing.
Buoyancy has to serve the stroke. If it replaces the stroke, the training value drops fast.
A better use than endless pull buoy work
Many swimmers reach for a pull buoy any time they want help with alignment. That can be useful, but it also changes the swim in a specific way by fixing the legs together and reducing how much the lower body participates. Buoyancy shorts offer a different kind of support.
They raise the hips while still allowing a more natural kick pattern and body roll. For triathletes, that often makes them a better bridge between pool technique work and race-relevant swimming. You still get support, but the stroke remains closer to what you need outside the lane line.
How to use buoyancy shorts in training
The best workouts with buoyancy shorts are built around transfer. Feel the improved position first, then test whether it stays with you after the shorts come off.
1. Alternate supported and unsupported repeats
Swim 6 x 100 at a steady aerobic effort. Wear buoyancy shorts on the odd repeats and remove them for the even repeats. Track stroke count and how rushed the breathing feels.
If the unsupported repeats get messy right away, that tells you something useful about where the drag is coming from.
2. Use them early in a longer aerobic set
Swim 3 x 400 at moderate effort. Wear the shorts for the first two, then swim the third without them. Pay attention to whether the head stays still and whether the kick remains light instead of urgent.
This works well for athletes whose form drops late in longer pool sessions.
3. Build pace without losing line
Swim 16 x 50 as 25 steady, 25 build. Use buoyancy shorts for the first half of the set and remove them for the second half. Many swimmers can hold posture at one speed and lose it as the pace rises. This set makes that obvious.
4. Replace some pull sets
Swim 8 x 150 aerobic in buoyancy shorts with no pull buoy. Let the legs stay relaxed, but do not let them go passive. This format supports alignment without turning the set into upper-body-only swimming.
Who benefits most
Different athletes use buoyancy shorts for different reasons. A few groups tend to get the most from them.
- First-time triathletes who need to feel a flatter body line and calmer breathing.
- Age-group racers whose form breaks down once fatigue builds.
- Open water swimmers who want support for longer aerobic work without wearing a full suit.
- Wetsuit racers who want pool sessions that better reflect the supported position they will feel on race day.
They are also useful for swimmers who assume they need more fitness when the real limiter is drag. Better position often lowers the cost of the work they are already doing.
Common mistakes
The first mistake is overuse. If every good swim happens in buoyancy shorts, there is no clear read on what improved and what was borrowed.
The second is passive use. You should notice something when you wear them: stroke count, breathing rhythm, head position, kick pressure, or how stable the catch feels. If you are not looking for feedback, the session turns into assisted swimming instead of skill development.
The third is poor progression. Swimmers who never remove the shorts mid-workout miss the transfer piece, which is where much of the learning happens.
Fit matters too. A buoyancy short should feel secure and swim-specific. If the fit is off, the support shifts, and the feedback changes with it.
How to fit them into a training week
Most triathletes do not need buoyancy shorts in every swim. One or two uses a week is enough for most athletes, especially when those uses are focused.
- Use them in one technique or aerobic session early in the week.
- Use them again in selected repeats of a longer set if body position usually fades under fatigue.
- Keep at least one swim each week completely free of buoyancy aids.
That pattern keeps the shorts tied to a purpose and protects the more important goal: owning the stroke without assistance.
Why this matters for racing
Triathletes often judge swim gear by one question: will it make the swim faster? Training tools deserve a better one: does this reduce the energy cost of the stroke?
A cleaner line in the water can lower drag. A quieter kick can save effort. More controlled breathing can keep the first part of the race from getting too expensive. Those gains matter in triathlon because the swim does not happen in isolation. Every bit of energy you waste in the water goes with you onto the bike and run.
That is where buoyancy shorts fit best. They are not there to flatter a training split. They are there to help you build a stroke that costs less over time.
Final take
Buoyancy shorts are at their best when you treat them as a position trainer. They can help you feel a better line in the water, reduce some of the drag caused by sinking hips, and make technical work more productive. They can also become a crutch if you never test what carries over without them.
Use them with a plan. Swim part of the session with support, part without it, and pay attention to what changes. That is where the real value shows up.
If you want a swim-specific option for that kind of training, the Blue70 LIFT Buoyancy Short was designed for exactly that role. For help with fit, visit the size charts or contact Blue70 support before your next swim.
