inclusion criteria: 1. persons who had mild to moderate covid- 19 illness. 2. asymptomatic period of at least seven days (without chest pain, breathlessness). 3. no musculoskeletal damage. 4. no pregnancy. 5. no visually identified asymmetries in the spinal trunk and lower limbs. 6. none of the subjects has a history of balance training 7. subjects will not have any diseases of the central nervous system. 8. subjects with body mass index (bmi)\<25 kg/m2.

inclusion criteria: 1. persons who had mild to moderate covid- 19 illness. 2. asymptomatic period of at least seven days (without chest pain, breathlessness). 3. no musculoskeletal damage. 4. no pregnancy. 5. no visually identified asymmetries in the spinal trunk and lower limbs. 6. none of the subjects has a history of balance training 7. subjects will not have any diseases of the central nervous system. 8. subjects with body mass index (bmi)\<25 kg/m2.

inclusion criteria: persons who had mild to moderate covid- 19 illness. asymptomatic period of at least seven days (without chest pain, breathlessness). no musculoskeletal damage. no pregnancy. no visually identified asymmetries in the spinal trunk and lower limbs. none of the subjects has a history of balance training subjects will not have any diseases of the central nervous system. subjects with body mass index (bmi)<25 kg/m2.

inclusion criteria: persons who had mild to moderate covid- 19 illness. asymptomatic period of at least seven days (without chest pain, breathlessness). no musculoskeletal damage. no pregnancy. no visually identified asymmetries in the spinal trunk and lower limbs. none of the subjects has a history of balance training subjects will not have any diseases of the central nervous system. subjects with body mass index (bmi)<25 kg/m2.

inclusion criteria: 1. persons who had mild to moderate covid- 19 illness. 2. asymptomatic period of at least seven days (without chest pain, breathlessness). 3. no musculoskeletal damage. 4. no pregnancy. 5. no visually identified asymmetries in the spinal trunk and lower limbs. 6. none of the subjects has a history of balance training 7. subjects will not have any diseases of the central nervous system. 8. subjects with body mass index (bmi)<25 kg/m2.

inclusion criteria: 1. persons who had mild to moderate covid- 19 illness. 2. asymptomatic period of at least seven days (without chest pain, breathlessness). 3. no musculoskeletal damage. 4. no pregnancy. 5. no visually identified asymmetries in the spinal trunk and lower limbs. 6. none of the subjects has a history of balance training 7. subjects will not have any diseases of the central nervous system. 8. subjects with body mass index (bmi)<25 kg/m2.