Propulsion

Muscular workout

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 glutes.

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

Tonifins are long.
- 36–37: 36.5 cm (14.4 in)
- 38–39: 39 cm (15.4 in) 
- 40–41: 41.5 cm (16.3 in)

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 swimming fins makes the target muscles work harder.

Fin length

Tonifins are semi-rigid.
Stiffness is characterized by the density of matter. As such, stiffer blades require greater muscular exertion. More flexible blades produce more efficient, sweeping kicks. How hard the kick depends on the type of workout desired (cardiovascular or muscle).

Fin stiffness

Tonifins have open foot pockets.
Fin foot pockets hold the foot in place when kicking (important for an efficient kick). 

Open foot pockets are less restrictive around the ankles.
Closed foot pockets hold your feet in their natural position.


Sports/

Water Sports/

Swimming/

Kickboards & Equipment/

decathlon

Swimming Fins, Tonifin