Here is the design of a clinical trial:

Official Title: "Determining the Feasibility of Chair-based Physical Activity Interventions, Aimed at Improving Various Aspects of Health and Wellbeing in Geriatric Populations With Pre-existing Frailty, Within a Hospital Ward Setting"

Included conditions:
- Frail Elderly Syndrome
- Frailty
- Physical Activity

Study Armgroups:
- {'label': 'Exercise Intervention 1: Move It Or Lose It (MIOLI)', 'type': 'EXPERIMENTAL', 'description': 'An established chair-based physical activity programme for older adults.', 'interventionNames': ['Other: Exercise Intervention 1: Move It Or Lose It (MIOLI)']}
- {'label': 'Exercise Intervention 2: Machine-based resistance training', 'type': 'EXPERIMENTAL', 'description': 'Specialised, chair-based resistance training equipment for older adults.', 'interventionNames': ['Other: Exercise Intervention 2: Machine-based resistance training intervention']}

Interventions:
- {'type': 'OTHER', 'name': 'Exercise Intervention 1: Move It Or Lose It (MIOLI)', 'description': 'An established chair-based physical activity programme for older adults.', 'armGroupLabels': ['Exercise Intervention 1: Move It Or Lose It (MIOLI)']}
- {'type': 'OTHER', 'name': 'Exercise Intervention 2: Machine-based resistance training intervention', 'description': 'Specialised, chair-based, pneumatic resistance training equipment for older adults.', 'armGroupLabels': ['Exercise Intervention 2: Machine-based resistance training']}

Primary Outcomes:
- {'measure': 'Feasibility', 'description': 'The primary dependent variable of this feasibility study will relate to the eight primary areas of focus of feasibility studies (Bowen et al. 2009), relating to:\n\n* Acceptability\n* Demand\n* Implementation\n* Practicality\n* Adaptation\n* Integration\n* Expansion and\n* Limited-efficacy testing\n\nThese eight aforementioned areas (constituting the one variable of feasibility) will serve as the primary dependent variable for this study, in order to establish the feasibility of a proposed future clinical trial within this setting. The dependent variable of feasibility will be assessed through semi-structured interviews with participants post intervention, while focus groups will be utilised with both the intervention implementers and study support staff in order to assess the primary dependent variable of the study. Participant uptake and adherence records will also be employed throughout.', 'timeFrame': 'Post-Intervention (2 weeks)'}

Please estimate the sample size based on the assumption: 
This sample size was based on initial expectations related to the obtainment of data saturation in the qualitative component of the study given its phenomenological approach.
Sample size
        This study aims to recruit a convenience sample of n =~30 participants: 15 in each intervention. No formal power calculations were conducted due to the feasibility nature of this study. This sample size was based on initial expectations related to the obtainment of data saturation in the qualitative component of the study given its phenomenological approach.50 51