Table 1.

Summary of the most important findings from previous studies that are relevant to the present study.

Authors	Title	Sources	Summary
Yen and Yang [34]	Multifunctional Folding Table	Patent	A folding table that can be placed in a confined space in the kitchen, dressing room, laundry room or garage.
Rui and Gao [41]	Design and Analysis of a Multifunctional Wheelchair	Journal Paper	-Designed to meet strength and safety requirements. -The adjustable posture from wheelchair to bed facilitates the work of caregivers and meets the needs of older people and people with disability.
Iksan and Susilawati [36]	Design of a Multi-Functional Wheelchair Based Fuzzy Analytical Hierarchy Process	Journal Paper	-Helps people who have difficulty walking due to illness, limited mobility or injury. -An additional function that facilitates the mobility and flexibility of users with disability in convenient bowel evacuation.
Mohite, Toraskar, Chaturvedi and Bose [40]	Design and Analysis of Advanced Walker Cum Rollator	Journal Paper	-The design of walking aids rarely takes into account aspects other than helping the user to walk. -A walking aid with multiple functions helps to reduce the problems of older people while adding value to them and improving their quality of life.
Mohite, Mollah, Bagchi and Singh [39]	Design of Hybrid Rollator Cum Walker for Elderly: Review on Literature	Journal paper	-Multifunctionality in walking aids is important to improve the quality of life of older people. -Walking aids could have other functions besides assisting with walking, such as sitting after prolonged walking or standing.
Gu, Wang, Sun and Wu [68]	Design of Multifunctional Combined Walking Aid	Journal Paper	-The design of the walker can perform multiple functions, such as folding and storing medicines in a cylindrical structure at the same time. -The walker is designed for older people to ensure their safety and reduce their mobility efforts by using a vertical wheel.
Costamagna, Thies, Kenney, Howard, Lindemann, Klenk and Baker [35]	Objective Measures of Rollator User Stability and Device Loading During Different Walking Scenarios	Journal Paper	-The practice of using the rollator should include more complex tasks representative of daily walking activities. -Rollators can be used in clinics as assessment tools for person-specific instruction and training, as well as evidence-based training for fall prevention.
Levinger, Panisset, Parker, Batchelor, Tye and Hill [37]	Guidance About Age-Friendly Outdoor Exercise Equipment and Associated Strategies to Maximise Usability for Older People	Journal Paper	-Outdoor exercise equipment is suitable for healthy adults and takes little account of the physical needs of older people -On-site supervision by exercise instructors should be provided to encourage older people to participate in outdoor exercise and to ensure that the equipment chosen is safe and suitable for their training.
Shedden and Kravitz [69]	Pilates Exercise: A Research-Based Review	Journal Paper	-Pilates is an effective method of body conditioning. -For older people, the springs are used to increase the training load and reverse muscle atrophy.
Roller, Kachingwe, Beling, Ickes, Cabot and Shrier [71]	Pilates Reformer Exercises for Fall Risk Reduction in Older Adults: A Randomized Controlled Trial	Journal Paper	Pilates reformer exercises significantly improve static and dynamic balance, functional mobility and active range of motion of the hip and ankle in adults over 65 years of age.
Suna and Işildak [42]	Investigation of the Effect of 8-Week Reformer Pilates Exercise on Flexibility, Heart Rate and Glucose Levels in Sedentary Women	Journal Paper	-Positive changes in physical and physiological characteristics through regular Pilates reformer training in sedentary women. -Regular exercise is important to reduce the risk of high blood pressure and diabetes, especially in older people.
Melville, Chang, Colagiuri, Marshall and Cheema [38]	Fifteen Minutes of Chair-Based Yoga Postures or Guided Meditation Performed in the Office Can Elicit a Relaxation Response	Journal Paper	-Participating in 15 min of chair-based yoga postures in the office improves physiological and psychological markers of stress. -In the long term, these practices can lead to significant health benefits, including a lower risk of cardiometabolic disease.
Kiser [72]	Decorative, Multi-Functional Exercise and Storage Bench	Patent	The unit has a storage space for storing exercise equipment such as weights, skipping ropes, water bottles, yoga mats, decorative hand weights and resistance bands.
Yu [73]	Multifunctional Exerciser	Patent	For simultaneous training of the hands, feet, lumbar spine and back of a user.
Wyatt and Wyatt [74]	Multifunctional Exercise Apparatus	Patent	Allows the user to couple one or more of the plurality of exercise media to the engagement channels, perform at least a first exercise by pulling the coupled exercise media from a contracted position to an extended position and change the orientation of the exercise media to perform at least a second exercise.
Lin [75]	Multifunctional Gym Exerciser with Adjustable Table	Patent	The user can replace the training attachments with the desired pedal unit, left leg unit and sit-up support depending on the different training requirements.
Wartes [33]	Multifunctional Pegged Furniture	Patent	Multifunctional items include an alternative chair, a step stool, a laundry basket, a two-tier table, a bench, a chest, a rocking bench, a toy box and a cradle.
Lee [30]	Multifunctional Chair	Patent	-Extended range of use. -Can be converted into a deck chair or ladder.
Tornabene, Babkes and Howell [32]	Combination Hand Truck, Stepladder, and Dolly	Patent	-Offers a versatile device for moving, lifting and supporting. -The device includes the functions of a hand lorry, a trolley and a stepladder.
Smith [31]	Ladder Top Storage Rack	Patent	Refers to fixing at the top of a ladder to keep tools and fasteners within reach with a ladder top shelf.