2. Using any crutches, walking frame, walking stick, prosthesis or similar walking aid which he habitually uses, he cannot walk a continuous distance of 100 metres along level ground without stopping or without suffering severe pain.
2. Using any crutches, walking frame, walking stick, prosthesis or similar walking aid which he habitually uses, he cannot walk a continuous distance of 100 metres along level ground without stopping or without suffering severe pain.