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.
Planks also strengthen inner core muscles that support your joints. The rectus abdominis and transverse abdominis that form your outer and inner abdominal muscles, respectively, are primary supporters during plank exercises. The abdominal obliques also stabilize the plank position isometrically.lank exercises might provide mental benefits that improve your mood. Plank exercises stretch muscles that commonly stiffen throughout the day and contribute to stress.