Propulsion

38° angle blades help target the hamstrings and glutes.

Muscular workout

These swimming fins are designed for intermediate swimmers looking to strengthen their hamstrings and buttocks.

Condition

Type of Footwear

Skill Level

Swim Fin Type

Fin Stiffness

Fastener Type

Main Material

Swimming fins are training accessories that make your lower body muscles work harder. This increases the intensity of your swim, strengthening your abs and lower body (thighs, glutes, calves). Swimming with fins burns fat and tones your muscles.

What are swimming fins?

Many female swimmers use swimming fins to strengthen their legs. Conventional fins mainly work the quadriceps, only minimally engaging the hamstrings and buttocks.

To work these muscles, we designed these fins with a blade set at a 38° angle, resulting in increased resistance when the fin moves up and decreased resistance when it moves down.

A Decathlon innovation


After 150 tests, we measured a 19% increase in hamstring use and a 27% increase in buttocks use.*
*Compared to Silifins fins

Testing

Tonifins are long.
- 36–37: 36.5 cm
- 38–39: 39 cm
- 40–41: 41.5 cm 

Short blades guarantee good kick frequency and a good cardio workout. Movements closely resemble natural swimming motions. 
Long blades guarantee a more sweeping kick and a more intense muscle workout.The long blade of the Tonifins fins makes the target muscles work harder.

Swimming fin length

Tonifins are semi-rigid.
Stiffer blades require greater muscular exertion. More flexible blades produce more efficient, sweeping kicks. Tonifins are suitable for both cardio and strength training.

Swimming fin stiffness

Tonifins have open foot pockets.

Foot pockets provide strong foot support when you kick and guarantee a more efficient movement. 
Open foot pockets are less restrictive around the ankles.
Closed foot pockets hold your feet in their natural position.
Tonifins’ open foot pockets provide support as well as greater freedom of movement.

Sports/

Water Sports/

Swimming/

Kickboards & Equipment/

nabaiji

Swimming Fins - Tonifins 500 Blue

4.0/5

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Louisa