The invention relates to a dynamic aerobic device for stretching and improving the flexibility of the feet, formed by: a foot stretcher (2), of approximately 43 cm in length, and a removable handle (1) of approximately 33 cm in length, as well as a strap that can be positioned either on the calf or above the knee (5) so as to allow two different uses. The device comprises: a central projection (9) of suitable dimensions corresponding to part of the sole of the foot a coupling mechanism with an internal screw thread and an external channel (18) a removable weight (11) on the outsole of the foot stretcher and a securing elastic half-sock that is wider at the open end (23) than at the closed end (24), said half-sock including convex faces (30 to 33) and rounded edges and corners (26), having different densities, and being provided with a band on the upper edge of the open end (34), with the possibility of half-socks being inserted inside one another.
