Each session (48) starts with 7 minutes of moderate warm-up exercises focusing on mobility and flexibility. Secondly, the strengthening exercises consist of knee extensions, knee flexions, hip abductions, ankle plantar flexions, and ankle dorsiflexions. Thirdly, a set of balance exercises including knee bends, backwards walking, walking and turning around, sideways walking, tandem stance, tandem walk,one-leg stand, heel walking, toe walking, toe to heel walking backwards, sit-to-stand, and stair walking. Finally, participants are instructed to walk at their usual pace for at least 10 minutes.

Each session (48) consist in isotonic exercises of low intensity and joint mobility of the lower extremities. These exercises are usually prescribed in medical consultations for the treatment of knee osteoarthritis.

Each session (48) starts with 7 minutes of moderate warm-up exercises focusing on mobility and flexibility. Secondly, the strengthening exercises consist of knee extensions, knee flexions, hip abductions, ankle plantar flexions, and ankle dorsiflexions. Thirdly, a set of balance exercises including knee bends, backwards walking, walking and turning around, sideways walking, tandem stance, tandem walk,one-leg stand, heel walking, toe walking, toe to heel walking backwards, sit-to-stand, and stair walking. Finally, participants are instructed to walk at their usual pace for at least 10 minutes.

It is a self-questionnaire consisting of 24 items divided into 3 sub-scales: pain (5 items): when walking on level ground, using stairs, in bed, sitting or lying down, and standing. Rigidity (2 items) morning and during the rest of the day. Functional capacity (17 items): use of stairs, getting up from sitting, standing, stooping, walking, getting in / out of a car, going shopping, putting on / taking off socks and / or socks, getting out of bed, lying on the bed, entering / leaving the shower / tub, sitting and getting up from the toilet, performing heavy and light household chores.

The NRS is a one-dimensional measure of pain intensity. The format is a line in which the participant selects a number between 0-10 that best reflects the intensity of the pain itself. A higher value corresponds to a greater intensity of pain.