When I was told by my dad to pack on some muscle and gain strength he recommended using clubs(my folks are Indian). Thing is I didn't want to look like a tosser swinging clubs around as a 14 yr old.
But from what i've seen you can get very strong using them. For example, once I went to meet my dad at the steel foundry where he used to work and there was another Indian chap who worked there.
The Foreman had allowed him to take some excess solid steel pipes for the purpose of club swinging, he got asked to demonstrate a movement and he slowly brought the pipe around his neck. When my dad tried he couldn't do it properly(this is a man whose built like an ox and who worked manual labour on farms and in a steel foundry on 13-14 hour shifts for 35 years!). So they are effective.
Oh yeah when he encouraged me to start 'club swinging' he suggested just fashioning them out of oak or some heavy wood(like they do back home), so people who buy those things are getting royally ripped off.
Oh I also read Coach Scott Sonnon interview, i'm very impressed by his opened mindedness. But I disagree when he say's some countries that primarily employ club training aren't successfull in sports for this reason alone. Case in point if you go to India the main reason we are so shit in sports is because the fucking government is so corrupt and any funding for sport is siphoned off to some shady official. Oh well.