7. Mountain climbers
While this exercise does help you improve your cardio and work out your abdominal muscles, benefits seem to come at a high risk. Your wrists and shoulders support an unnecessary strain during this exercise, while a bad posture can also often lead to injuries in your lower back.
If you’re looking for a safe alternative to mountain climbers, single leg planks will do a better job. By holding one leg up during the exercise you make sure your core muscles get all the action while preventing potential damage from harmful postural habits.