Inclusion Criteria:  Informed consent to participate in the study. Experienced infection with SARS-COV-2. Age 19 - 26 years No injuries to lower limbs in the period of 12 months preceding the date of enrolment into the study No orthopaedic disorders affecting the lower limbs (including decreased length of the lower limbs) No diagnosed neurological diseases or disorders (including labyrinth dysfunction) No diagnosed impairment of concentration and attention  Exclusion Criteria:  Lack of informed consent to participate in the study No experience of infection with SARS-COV-2 Age outside the range of 19 and 27 years Confirmed injuries to lower limbs in the period of 12 months preceding the date of enrolment into the study Confirmed neurological diseases or disorders, such as impaired balance, concentration and attention.