Intervention Group will be asked to follow the actions in the provided video. It lasts for approximately 30 minutes, with 5-minute warm-up and cool-down exercises respectively, a 4-minute song repeating for 4 times and a 1-minute rest in between each repetition. Videos, in the form of a YouTube link, will be distributed for the Intervention Group, as well as the leaflets.

Control Group will receive a leaflet on 10 actions extracted from mOEP, 2 actions from conventional OEP and 1 action from Mini-BESTest. The participants will perform 8-16 repetitions for each action, with 3-5 seconds of rest between actions.

Our study attempts to establish a new home-based exercise option incorporating mOEP with video, music and lyrics. Our new approach shares the same aims with Exergames and video-supported methods - to increase the exercise motivation of elderlies, hence their physical performance. Based on the video-supported approach in one previous study, we add in the component of music therapy. Music-based exercise interventions could produce positive outcomes on both physical, such as gait, balance and fall risk and level of physical activities and psychological, including exercise adherence, perceived exertion, thus extending exercise duration. However, exact mechanisms have not been revealed and it may be limited by personal preferences on music. In our video, the music we chose is of brisk rhythm, slightly delightful melody and higher pitch, which all help to shape a cheerful and relaxing atmosphere for the elderlies.

The Falls Efficacy Scale-International (FES-I) is a modified version of the FES, based on the perceptive feeling on fall risks of the participants. It is a 16-item questionnaire on a 4-point ordinal scale, emphasizing social and physical activities. The minimum and maximum score is 16 and 64 respectively while a lower score indicates higher confidence in one's balance ability.

Functional Reach Test (FRT) is a common clinical outcome measure on dynamic standing balance. The participants were required to stand adjacent to a wall with a meter ruler fixed and to raise their preferred upper limb to the shoulder level. They were then instructed to reach as far as possible while maintaining their balance without moving both lower limbs for two trials, following one mock trial. The result recorded was the average distance from the reading of the tip of the third digit of the two trials. The longer the subject reaches, the better their dynamic balance.

The Montreal Cognitive Assessment 5-minute protocol (MoCA 5-min protocol) version 20151030 is an abbreviated Chinese version of conventional MoCA, including 4 subtests. It emphasizes on the examination of 5 cognitive domains, which incorporates attention, verbal learning and memory, executive function and orientation. Participants were required to recall 5 words from the first trial, name animals for 1 minute, answer 6 items on date and geographic orientation and to remember the 5 words provided at the beginning of the test. The maximum score for the test is 30 while a higher outcome indicates better cognitive ability.