Bodybuilding Online Guide

I’m considering working out this summer to improve my upper body, mainly the abdominal section. What equipment would you recommend?

Testimonials are always welcomed. If you’ve used the equipment before, please say so. How well did it work for you? When did you start seeing results?

Thank you in advance!
Oh, and by the way, I don’t want bulky equipment that can’t be went around easily. I just want portable equipment.