Here is the design of a clinical trial:

Official Title: Investigating the Feasibility and Acceptability of a Technology Delivered Physical Activity (PA) Intervention in Cancer: The IMPETUS Cancer Trial. (IMproving Physical Activity and Exercise With Technology Use in Cancer Survivors)

Included conditions:
- Cancer, Breast
- Cancer, Colorectal
- Malignancy

Study Armgroups:
- {'label': 'Intervention', 'type': 'EXPERIMENTAL', 'description': 'Participants in this group will receive the intervention. They will receive a Fitbit activity tracker, and will also receive support and goal setting with a view to improving their daily physical activity.', 'interventionNames': ['Behavioral: Intervention']}

Interventions:
- {'type': 'BEHAVIORAL', 'name': 'Intervention', 'description': 'A physical activity intervention, delivered remotely using a combination of the Fitbit application and support from a chartered physiotherapist.', 'armGroupLabels': ['Intervention']}

Primary Outcomes:
- {'measure': 'Change in Physical Activity (Objective)', 'description': 'Accelerometry will be used to monitor 7 days of activity at Week 0, Week 12 (+/- 2 weeks) and 24 weeks (+/- 2 weeks) post baseline.', 'timeFrame': 'Baseline, 12 weeks, 24 weeks'}
- {'measure': 'Evaluation of recruitment capability and resulting sample characteristics', 'description': 'The number of participants we can recruit will be assessed. This will explore the potential sample size of the randomised control trial.', 'timeFrame': '12 weeks'}
- {'measure': 'Data collection procedures and outcome measures', 'description': 'Procedures to collect data will be assessed for suitability and outcome measures used will be analysed for optimisation of measurement of clinical outcomes', 'timeFrame': '12 weeks'}
- {'measure': 'Acceptability and suitability of the intervention and study procedures', 'description': 'Compliance with daily logging of exercise information and adherence to the intervention duration will be assessed', 'timeFrame': '12 weeks'}
- {'measure': 'Use of resources and ability to manage and implement the study and intervention', 'description': 'The ability of study personnel and the availability of resources to implement the study will be assessed, demonstrated by successful implementation of the intervention', 'timeFrame': '12 weeks'}
- {'measure': 'Preliminary evaluation of participant responses to intervention', 'description': "The qualitative outcome in this feasibility study will invite participants' to provide feedback on the intervention's likelihood of being successful. Satisfaction with the technological intervention will be measured using a questionnaire given to participants at study end (12 weeks).", 'timeFrame': '12 weeks'}
- {'measure': 'Change in body composition', 'description': 'This will be measured at baseline, 12 weeks (Intervention end) and 24 weeks post -baseline (Follow-up). This will be measured in percentage body fat.', 'timeFrame': 'Baseline, 12 weeks and 24 weeks'}
- {'measure': 'Change in self-report PA', 'description': 'A modified version of the Godin Leisure Time Exercise Questionnaire will be used.', 'timeFrame': 'Baseline, 12 weeks and 24 weeks'}
- {'measure': 'Change in quality of life', 'description': 'The FACT-G scale (general) (Cella et al 1993) will be used to assess quality of life.', 'timeFrame': 'Baseline, 12 weeks and 24 weeks'}
- {'measure': 'Change in aerobic capacity/endurance', 'description': 'This will be measured using the 6MWT (Six minute walk test).', 'timeFrame': 'Baseline,12 weeks and 24 weeks'}
- {'measure': 'Change in BMI', 'description': 'This will be measured at baseline, 12 weeks (Intervention end) and 24 weeks post -baseline (Follow-up). This will be measured in kg/m\\^2.', 'timeFrame': 'Baseline, 12 weeks and 24 weeks'}
- {'measure': 'Change in Body Weight (kg)', 'description': 'This will be measured at baseline, 12 weeks (Intervention end) and 24 weeks post -baseline (Follow-up). This will be measured in kg.', 'timeFrame': 'Baseline,12 weeks and 24 weeks'}
- {'measure': 'Change in waist circumference', 'description': 'This will be measured at baseline, 12 weeks (Intervention end) and 24 weeks post -baseline (Follow-up). This will be measured in cm.', 'timeFrame': 'Baseline,12 weeks and 24 weeks'}
- {'measure': 'Change in quality of life', 'description': 'The physical functional measure of the SF-36 (Brazier et al 1992) will be used to measure quality of life.', 'timeFrame': 'Baseline,12 weeks and 24 weeks'}

Please estimate the sample size based on the assumption: 
20% dropout rate is assumed.
Sample size
          The difficulties of generating accurate sample size calculation for feasibility studies are well known. For feasibility studies, sample sizes between 24 and 50 have been recommended.40 Based on this, we propose to recruit a sample size of 60 which allows for aÂ 20% dropout.