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When throwing a punch it's often recommended one throw ones weight into it. Does it make much of a difference with what constitutes that weight?

For example, say you have a guy with 130lbs lean mass and 10lbs fat (ie. 7% body fat) and another guy with 130lbs lean mass and 50lbs body fat (ie. 38% body fat). Would the 38% body fat guy be able to throw a more powerful punch simply because he weighs more?

If so than this also makes me wonder... what other "exercises" would being overweight be an asset? Like would the 38% body fat person in the above example be able to do better at standing med ball tosses than the 7% body fat person simply because he'd have more weight to leverage when tossing the ball?

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Extra weight can help in most sports with weight classes... certainly in strength and combat sports it seems to be the case (other considerations like endurance aside). –  Greg Oct 14 '13 at 14:22
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The person with the higher body fat may or may not be able to throw a more powerful punch. Punching is very technique driven, and a smaller person with better technique will be able to punch harder/quicker than someone with lesser technique.

However, if we assume that two individuals have the same technique, the person with the higher body fat may have a slightly more damaging punch just because of the extra weight moving with the arm. An arm is generally about 5% of total body weight, so in your example (40 lbs of difference) there would be about 2 lbs of direct extra mass on the arm, which would, in turn, make the punch slightly more effective. (Force = mass x acceleration)

Where it could make a bigger difference is in receiving punches, in that larger massed opponents will spread the impact out slightly, and there is more fat in between the impact point and subsurface structures.

The main point behind telling someone to "get their weight" behind a punch more addresses technique and the type of punch than anything. A jab, for example, is mainly driven by arm and shoulder muscles and doesn't (generally) cause much damage. A cross (reverse punch in martial arts) starts with the planting of the feet, torques up through the legs and hips, engages the trunk muscles, and drives all that force through the impact point. That's what is generally meant by "get your weight behind it", rather than just a straight application of more mass.

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Agreed. There's also a big difference between power as a result of solid muscle mass and power as a result of extra fat. The solid muscle mass can move faster because it's actively involved in the strike. Fat is a passive mass that can resist the speed of movement (I speak from experience here). In short, someone who is 240 lbs and 10% fat can punch with more power than someone who is 300 lbs and 30% fat. –  Berin Loritsch Oct 14 '13 at 16:31
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The lower your body fat, the faster you fatigue and also quicker you feel stressed.

don't take me wrong on this comment Fat is a very slow release source of energy and when the protein source gets depleted in your body, the system kicks in to burn fat as a fuel to keep it up. This is the main reason for the fatigue.

Even in strength training having a reasonable amount of fat (Not over, Not under) will keep your joints from being damaged unless you deliberately draining your body from fat for a competition. During this period, you should watch out for the good form and controlled weight to prevent injury.1

This point comes into action in most of heavy weight lifting sports and joints are padded and lubricated by fair amount of stored fat. (and possibly can be a positive). However those athletes benefit from a very strong cardiovascular system and having that extra weight won't be phrased exactly as being "overweight". Excessive fat can be the cause of lot of problems in the body and a good starting point for most issues.

"Conclusion A lower daily fat intake and lower percentage of total energy from fat were associated with increased injury risk among competitive female runners. Lower energy intake and lower energy availability approached, but did not reach, a significant association with overuse injury in this study. By documenting these risk factors, it is hoped that future research will continue to investigate their role in injury development, thus leading to better strategies to predict and reduce running injuries in women."1

Additional resources for self-read:

Eating Habits That Reduce Injury Risk

LESS FAT IN DIET LINKED TO INJURY RISK IN RUNNERS

1)Gerlach, Kristen E., et al. "Journal of the International Society of Sports Nutrition." Journal of the International Society of Sports Nutrition 5 (2008):

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Do you have any sources for that? –  Lego Stormtroopr Oct 14 '13 at 4:51
    
In the judiciary system first they ask for the proof & then in case of lack of it then they judge against. If the reference explanatory enough I would like you to reconsider your negative vote. We want the message to carry the right message and not misleading. –  Mehrad Oct 14 '13 at 5:38
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You sites you link to talk about dietary fat, the question is about body fat. –  Baarn Oct 14 '13 at 7:57
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Yes, we do want the message to carry correct information. Your answer is barely even related to the original question. –  JohnP Oct 14 '13 at 16:44
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