Final answer:
The Russian twist exercise and side planks strengthen the core muscles, particularly the abdominal and oblique muscles. Incorporating a variety of core exercises, including these, can provide a comprehensive core workout.
Step-by-step explanation:
The Russian twist exercise and side planks are exercises that improve core strength. Both of these exercises target the muscles in your core, which include the abdominal muscles and the oblique muscles. The Russian twist primarily works the oblique muscles, which are located on the sides of your abdomen. By rotating your torso during this exercise, you engage these muscles. On the other hand, side planks primarily target both the oblique muscles and the transverse abdominis, which help to stabilize the core.
Engaging in a variety of core exercises can make your workout more interesting and challenging. For instance, simple exercises like push-ups and planks, when performed alongside other core exercises like crunches and leg lifts, provide a comprehensive workout for your core strength. This can improve not only the aesthetic appearance of your core but also enhance functional strength and stability.