Daily backpacker budget: $20 ~ $35. Bolivia is the ultimate cheapie of South America. Things may be very basic here as itâs a dirt poor country but your dollars sure go a long way. It is the cheapest country for accommodation and the cheapest for food and drink as well.
The plank strengthens the abdominals, back, and shoulders. Muscles involved in the front plank include: 1  Primary muscles: erector spinae, rectus abdominis (abs), and transverse abdominus.he plank strengthens the abdominals, back, and shoulders. Muscles involved in the front plank include: 1  Primary muscles: erector spinae, rectus abdominis (abs), and transverse abdominus.
If youâre interested in using your own body weight to get fit and functional, but donât know exactly what muscles does the plank work, this article gives you a refreshing look at one of the best forms of exercise out there!nstead, they look a lot like the guy in this explanation of how to do a plank. 1  The conventional plank is considered to be a core exercise and there are four ways to do it on the ground: front, both sides for the obliques and then reverse where the glutes face downward.