The F.I.T. principle for cardiovascular fitness stands for Frequency, Intensity, and Time. For children and adolescents, the general recommendations suggest engaging in at least 60 minutes of moderate to vigorous physical activity most days of the week.
Based on the exercise schedules provided:
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Golfing for 60 minutes, 2 times a week - Total of 120 minutes per week. This may not meet the recommended frequency for cardiovascular fitness.
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Tennis for 60 minutes, 3 times a week - Total of 180 minutes per week. This is a good option, combining a higher frequency and a likely moderate to vigorous intensity.
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Walking for 40 minutes, 5 times a week - Total of 200 minutes per week. While walking is a moderate activity, the intensity may be lower depending on the pace.
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Swimming for 40 minutes, 4 times a week - Total of 160 minutes per week. Swimming can be a vigorous activity and provides good cardiovascular benefits.
Among these options, Tennis for 60 minutes, 3 times a week is likely the most suitable choice because it combines a good level of intensity with a sufficient frequency in line with F.I.T. principles for cardiovascular fitness in a 12-year-old boy.
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