Rehabilitation and assistive devices using shape memory alloy (SMA) for lower limbs and weightlifting. (a) Ankle-foot orthosis (AFO) based on the super-elastic SMA hinge [67]. (b) Knee-ankle-foot orthosis for patients with quadriceps muscle weakness [68]. (c) Ankle rehabilitation platform with a periodic cooling system [69]. (d) Novel omega (Ω)-shape SMA actuator for neurology and neuromuscular rehabilitation [70]. (e) Concept of an SMA-based wearable robotic assistive device for stair climbing assistance and (f) mechanism [71]. (g) SMA-based fabric muscle (SFM) used for suit-type wearable robot (STWR) [72].