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.
By strengthening core muscles you will not only be on a fast track to a flatter stomach but will also improve the effectiveness of any exercise you do. The plank is one of the best exercises because it tightens the deepest core muscles. Itâs a static exercise where you use your arms to raise yourself off the floor and hold the whole body straight and rigid, like a plank of wood.