I've noticed as well that a lot of the people that I discuss weight training with focus on the upperbody wayyy too much. Their size and strength in the upperbody makes them look foolish in comparison with their chicken legs. these guys may be benching 250+ but can't even squat that amount. Even if you are just working on being a body builder / power lifter competitor you need to incorporate a good healthy balance in your routines.
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Strength training is important to fitness, athletics and functionality. It's also recommended for fat loss and can assist perhaps even more so then cardio training for that purpose. However the best fitness plans are balanced between cardio, flexibility, range of motion, and strength training along with sport specific movements and drills for athletes.
I'm not an expert on the topic of fitness just a weekend warrior with a gym membership. I've been lifting since august and taken it very seriously since January but also incorporated running, swimming, cycling, yoga and plyometrics along with the strength and basketball training. My success with this program has been real, I've dropped over 50 lbs and a number of body fat % points along with increasing my strength by ~300%.
Even after a year solid of training, reading, researching, putting in work at the gym, track and court I realize I'm still a total n00b in the area of fitness. Guys like metro have made a living out of fitness, athletics and body aesthetics. I think most people would be well served to listen to what metro has to say, especially concerning the "functional" strength increases. Sure lifting heavy things may give you the "look" you want (if you want to be a hyuge dude with teh biceps and teh pecs) but a balance needs to be achieved to lead a healthy lifestyle.
In the end it's really about a persons specific goals and needs. If you're the kind of guy that needs to lift awkward heavy **** on a regular basis (maybe a construction laborer?) then perhaps sandbag lifting is the best option for you. But for the average person there are better ways to achieve a healthy body and fitness level that is more functional.
Just as a note I've listened to metro regarding a cardio program he gave me and it was the difference from running a mile in 10 minutes to running a mile in 7 minutes. Listen to this dude!