NEED HELP!!! Imagine that you are holding a weight. Why is there more benefit if you lift the weight by bending at the elbow than if you swing your arm?

Aresearcher created three groups based on participants bmi: normal weight, overweight and obese. the hypothesis being tested is that the three groups differ in the mean number of artificially sweetened drinks consumed weekly. which statistical test might the researcher use, assuming a reasonably normal distribution of values.