The type of physical activity that fits these criteria for Tomas is:
D. muscle strengthening
Explanation:
Tomas has been experiencing some pain on his back. Strengthening muscles, especially in the core and pelvis areas, can be beneficial to alleviate or prevent back pain. He also wants to get into better shape. Muscle strengthening helps with muscle toning and growth. Finally, he wants to go to a gym where he will use exercise bands and weight machines. Such equipment is used for muscle strengthening as well. Therefore, letter D seems to be the best option.
