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.
The plank can strengthen your core, fix poor posture, and reduce lower-back pain. But as youâre hovering there, why not make the move do double duty? These five awesome plank variations provide all the benefits of the classic core-sculpting move, while also chiseling bigger arms, building a broader back, skyrocketing your heartrate, or increasing your flexibility.