Here is the design of a clinical trial:

Official Title: Baduanjin Exercise for Patients With Chronic Heart Failure on Phase II Cardiac Rehabilitation: A Prospective, Randomized, Controlled Clinical Trial

Included conditions:
- Rehabilitation With CHF; NYHA Class I or II

Study Armgroups:
- {'label': 'Baduanjin exercise group', 'type': 'EXPERIMENTAL', 'description': 'Participants in this group received routine rehabilitation training and Baduanjin exercise', 'interventionNames': ['Behavioral: Baduanjin exercise']}
- {'label': 'Routine rehabilitation group', 'type': 'ACTIVE_COMPARATOR', 'description': 'Participants in this group only received routine rehabilitation training', 'interventionNames': ['Behavioral: Routine rehabilitation group']}

Interventions:
- {'type': 'BEHAVIORAL', 'name': 'Baduanjin exercise', 'description': 'Participants in this groups received routine rehabilitation training and Baduanjin exercise. During the period of rehabilitation, physicians provides a wide range of medical, nutrition and mental health counseling, as well as rational drug-treatment. Baduanjin exercise protocol according to the "Health Qigong Baduanjin Standard" enacted by the General Administration of Sports in 2003. Due to the low-activity tolerance of CHF patients, we performed with a refined version of Baduanjin. Each Baduanjin exercise session lasts 45 minutes and continues twice per week for 12 weeks.', 'armGroupLabels': ['Baduanjin exercise group'], 'otherNames': ['Routine rehabilitation']}
- {'type': 'BEHAVIORAL', 'name': 'Routine rehabilitation group', 'description': 'Participants in this qroup only received the routine rehabilitation training. During the period of rehabilitation, physicians provides a wide range of medical, nutrition and mental health counseling, as well as rational drug-treatment. They should also come to rehabilitation center for physical exercise,45 minutes per day，twice per week, lasts 12 weeks.', 'armGroupLabels': ['Routine rehabilitation group']}

Primary Outcomes:
- {'measure': 'Six-minute walk test（6MWT）', 'description': 'Testing patients changes on walking distance and accompanies symptoms in 6 minutes', 'timeFrame': 'Baseline, 3 months'}

Please estimate the sample size based on the assumption: 
Type I error rate (alpha) = 0.05, μ1-α = 1.64, Type II error rate (beta) = 0.1 (power = 90%), μ1-β = 1.282, 20% loss to follow-up within 6 months.
Sample size calculation
        Sample size is calculated, based on the 6MWT, according to the following superiority test formula:\documentclass[12pt]{minimal}
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				\begin{document}$$ {n}_c=\frac{\left(1+\frac{1}{k}\right){\left({\mu}_{1-\alpha }+{\mu}_{1-\beta}\right)}^2{\sigma}^2}{{\left[\left({x}_t-{x}_c\right)-\varDelta \right]}^2}, $$\end{document}nc=1+1kÎ¼1âÎ±+Î¼1âÎ²2Ï2xtâxcâÎ2,
        ntâ=âknc, The patientsâ numbers were arranged in equal proportion (kâ=â1), a superiority one-sided test was employed. According to result of a previous study [32], xtâ=â512.5, xcâ=â436.2, Î´tâ=â50.2, Î´câ=â49.8, Î´ is the estimated standard difference calculated as 50.0, and Îâ=â0.9, Î´â=â45.0. Setting a type I error rate of alpha at 0.05, Î¼1-a=â1.64, and setting a type II error rate of beta at 0.1 (a power of 90%), Î¼1-Î²â=â1.282, the calculated sample size of each group is around 49. Assuming conservatively that 20% may be lost to follow-up within 6Â months, the total sample size needed to detect this difference at a 5% level of significance with a power of 90% is 118 patients. For our study, we decided to recruit 120 patients for the convenience of randomization.