What is the most efficient exercise?

Related questions

1. Why does my back stiffen up when I walk?
2. Should you do back exercises everyday?
3. What is the best exercise for back pain?
4. Why planks are better than crunches?
5. What are plank walks?
6. Why my lower back hurts when I walk?
7. How long should you plank a day?
8. Why does my back hurt every morning?
9. Can I do lower back exercises everyday?
10. What is reverse plank good for?

Tags

1. #balance
2. #hamstrings
3. #exaggerated
4. #quadriceps
5. #major
6. #because
7. #cotton
8. #walking
9. #exercise
10. #gluteals
11. #improve
12. #lower
13. #mimics
14. #squats
15. #petersen
16. #helping
17. #muscles
18. #lunges
19. #lunge
20. #advanced
21. #great