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.
January 10, 2014. The plank is one of the best exercises to strengthen your core, which is more than just your abdominals. The core is a complex series of muscles that includes your entire body, minus your legs, head and arms. Various plank exercises challenge all the major muscle groups and stabilizers, improve strength, and prevent injury.