Final answer:
The group doing the cardio workout daily is the Experimental Group in an experimental study, exposed to the independent variable, which contrasts with the Control Group.
Step-by-step explanation:
The group that did the cardio workout daily would be classified as the Experimental Group. In an experimental study, this is the group that is exposed to the experimental manipulation. In this context, the independent variable is the cardio workout because it is what is being manipulated or controlled by the experimenter. The experimental group is different from the Control Group, which would not be exposed to the cardio workout, to provide a basis for comparison. To assess the effectiveness of the cardio workout, the dependent variable could be any number of outcomes that are being measured by the researcher, such as changes in physical fitness, weight, or cholesterol levels, which would illustrate the effect of the independent variable.