of a better comprehension of the characteristics of the invention this description is accompanied by a set of drawings in which illustrative but not limiting figures represent the most characteristic details of the invention 0021 fig1 shows a view in perspective of the dynamic footrest and it can be seen that it has a support platform for each of the user 39 s feet both platforms swivelling with respect to the same axle of rotation and having a driving system to provide these platforms with movement 0022 fig2 shows a view in perspective of a pair of support platforms for the feet relative to the dynamic footrest in whose practical execution the axle of rotation is positioned with respect to the front part of them 0023 fig3 shows a view in perspective of a pair of support platforms for the user 39 s feet as a variant of practical execution in which case the axle of rotation of them is slightly displaced towards the interior of both platforms 0024 fig4 shows a view in perspective of a pair of support platforms for the user 39 s feet as a variant of practical execution in which case the axle of rotation of them is positioned with regard to the transverse central axle of the platforms in view of the figures commented above and according to the numbering system adopted it can be seen that the dynamic footrest 1 comprises a first platform 2 and a second platform 3 being mounted on a swivel around the same axle 4 in such a way that the two platforms 2 and 3 provided with a vertical oscillating movement are adjacent and.