See exactly how much resistance each disc generates at any training intensity — based on real fluid dynamics.
Training Intensity
Move the slider to simulate your stroke speed in water
50%
≈ 1.00 m/s
RecoveryWarm-upFitnessTrainingRace PaceMaximum
↓ Scroll to see disc comparison
MobilityFitnessPerformance
Move the slider to calculate resistance forces for each disc.
Max Resistance
FLOW 255
FLOW
255 mm · 51.1 cm²
0.0
kg steady drag
0.0 N
Peak Force (first stroke)
0.0 kg
incl. water inertia at 2.0 m/s²
Drag area51.1 cm²
ModeGrip / Kinetic
Ideal forMobility & Recovery
FIT 275
FIT
275 mm · 59.4 cm²
0.0
kg steady drag
0.0 N
Peak Force (first stroke)
0.0 kg
incl. water inertia at 2.0 m/s²
Drag area59.4 cm²
ModeGrip / Kinetic
Ideal forFitness & Conditioning
FLEX 295
FLEX
295 mm · 68.3 cm²
0.0
kg steady drag
0.0 N
Peak Force (first stroke)
0.0 kg
incl. water inertia at 2.0 m/s²
Drag area68.3 cm²
ModeGrip / Kinetic
Ideal forPeak Performance
Side-by-side comparison
FLOW 255
0.0 kg
FIT 275
0.0 kg
FLEX 295
0.0 kg
The physics behind the numbers
Aqua-Bend discs use fluid drag. Resistance scales with the square of your movement speed — the faster you move, the harder the water pushes back.
F = ½ × Cd × ρ × A × v² + madded × a
Cd = 1.17
Drag coefficient of a flat disc
ρ = 1000 kg/m³
Water density (800× denser than air)
A = disc area
FLOW 51.1 / FIT 59.4 / FLEX 68.3 cm²
m_added = ρ·r³·π/3
Added water mass per disc size
Peak Force includes water inertia — the mass of water that accelerates with the disc at the start of each stroke. Larger disc = more water mass = significantly higher initial resistance. At a = 1.5 m/s²: FLOW +1.6 kg · FIT +2.1 kg · FLEX +2.6 kg above steady drag.
Ready to feel the force?
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