Reason:

1, the trace element that is helpful for fitness is mainly zinc, which can help muscles grow better. In addition, protein is the most important one. Protein is the basic element of muscle synthesis. Without enough protein, you can't grow muscles.

2. Calcium is not an element needed for fitness. Calcium does not help to promote testosterone secretion or muscle synthesis, nor does it participate in the whole process. Calcium is only a common element in human body, and it is of little use for fitness.

3, fitness should be supplemented with zinc. Fitness people recommend eating bananas, because bananas contain zinc and sugar, which is helpful for fitness, and foods containing calcium are not recommended.