Here is the design of a clinical trial:

Official Title: The PreventIT Feasibility Randomised Controlled Trial in Young Older Adults, Comparing Two Lifestyle-integrated Exercise Interventions Delivered by Use of ICT or an Instructor, With a Control Group

Included conditions:
- Young Older Adults

Study Armgroups:
- {'label': 'aLiFE', 'type': 'EXPERIMENTAL', 'description': 'The aLiFE programme is developed for young older adults, where balance activities, strengthening activities, and specific recommendations for increasing physical activity, are embedded within everyday activities, so that the activities can be performed multiple times throughout the day. The programme is presented by an instructor by use of a paper based manual during a 6 month intervention period in participants homes.', 'interventionNames': ['Behavioral: aLIFE']}
- {'label': 'eLiFE', 'type': 'EXPERIMENTAL', 'description': 'The aLiFE programme is transferred to a mobile health system, called the eLiFE. The intervention is delivered on smartphones and smartwatches including inertial sensors well suited to monitor physical activity and movement quality in daily life. An instructor teaches the participants how to use the mobile health system during home visits and phone calls during the 6 month intervention period. A virtual instructor teaches the participants the eLiFE programme. Pictures and videos of the aLiFE activities are delivered by use of the system. Behavioural change strategies are also included in the system.', 'interventionNames': ['Behavioral: eLIFE']}
- {'label': 'control', 'type': 'ACTIVE_COMPARATOR', 'description': "The control group follows the World Health Organization's recommendations of physical activity.", 'interventionNames': ['Behavioral: control']}

Interventions:
- {'type': 'BEHAVIORAL', 'name': 'aLIFE', 'description': 'The aLiFE programme is taught by an instructor during six home visits and 3 phone calls during the 6-month intervention period. The programme will be personalised by use of an initial balance and strength assessment (aLiFE assessment tool). The participants assigns activities to his or her daily activities, and during subsequent home visits, the number of activities and task demands are upgraded. Participants will be taught how to select opportunities themselves to embed activities into their individual daily routine, and how to progress over time.', 'armGroupLabels': ['aLiFE']}
- {'type': 'BEHAVIORAL', 'name': 'eLIFE', 'description': 'The eLIFE includes a personalised ICT-administered training schedule using the activities developed in aLiFE, delivered in the form of video clips, pictures and text/verbal instructions on a smartphone and smartwatch application. Personalisation of activity content will be decided based on a phenotype tool and initial difficulty level is decided through the aLiFE assessment tool. In addition, a virtual instructor teaches the participants how to carry out the eLiFE programme. The user receives motivational messages and feedback, and there will be a possibility for social interaction between the participants. The instructors teach the eLiFE participants the programme during 4 home visits and 3 phone calls during the 6 month intervention period.', 'armGroupLabels': ['eLiFE']}
- {'type': 'BEHAVIORAL', 'name': 'control', 'description': "The control group follows the World Health Organization's recommendations of physical activity. The control participants will receive one home visit and be given a written letter with the activity recommendations.", 'armGroupLabels': ['control']}

Primary Outcomes:
- {'measure': 'Self-reported function and disability', 'description': 'Measured using the Late-Life Function and Disability Instrument (LLFDI)', 'timeFrame': 'Change; baseline, 6 months and 12 months'}
- {'measure': 'Behavioural complexity metric', 'description': 'A composite measure of physical activity, sleep, and social participation, measured by a unitless scale. Physical activity and sleep is objectively measured by activity monitors worn at the lower back and the wrist, while social interaction is assessed as phone calls.', 'timeFrame': 'Change; baseline, 6 months and 12 months'}

Please estimate the sample size based on the assumption: 
The study aims to estimate critical parameters based on a Norwegian population-based study. The sample size of 180 participants is considered sufficient, which is twice the minimum required number of participants (2× n=90) as a general rule to estimate a parameter.
Sample size and recruitment
        No sample size calculation was performed for this study as it is a feasibility study not designed to conclude on effectiveness. However, based on a Norwegian population-based study,25 the sample size (n=180) is estimated to be large enough to estimate critical parameters,26 which equals twice the minimum required number of participants suggested (2Ã n=90) as a general rule to estimate a parameter.27 28
        Participants are drawn from the general population with the purpose of identifying those estimated to be at risk of accelerated functional decline. The number required to invite in order to reach 180 participants is not predefined, due to insufficient knowledge about ability/function in this age group and because the risk screening tools (see below) are newly developed.16 A contact list was provided for home-dwelling individuals between 61 and 70 years of age living in Trondheim, Amsterdam and Stuttgart, stratified by age and with even distribution of men and women in each age stratum. The initial draw from each local registry was set at 2000 persons, with the intention of performing a second draw if necessary.