This could be considered the "corollary" to #2.  Doing a set of 100 barbell snatches is absurd, as technique breaks down, and the amount of weight an athlete can use is almost too trivial to even call it metabolic RESISTANCE training.  Plus, it would likely take about 2-3 minutes to complete, which means that you're getting much more aerobic, even if an athlete is "working hard."  My feeling is that you use your work bouts to challenge anaerobic systems, and your recovery period to condition the aerobic energy system.  Let's be honest: most strength training enthusiasts care more about the aerobic system for recovery than actual aerobic exercise performance, anyway.
Just briefly I want to mention something for the more savvy readers out there. Many, who are well versed in metabolism, will immediately point out that if you lose weight, then of course you are going to be burning less calories because you have less body tissue. True. But what research shows, and my clinical experience validates, is that the reduced rate of metabolic output goes far beyond what would be predicted from loss of fat mass or muscle mass.
The good news is that if you suspect you might have metabolic damage there are real answers and solutions and even tests to tell you what is going wrong in your body.  For those looking to get answers on how to fix metabolism problems and metabolic damage we have created a FREE  3 part Metabolic Repair Video Course that walks you through all the steps.  From how to get the correct tests to a done for you comprehensive metabolism assessment we cover it all in the course.  The course will teach you:

The oral glucose tolerance test (OGTT), or glucose tolerance test is a blood test used (not routinely however) to diagnose diabetes, and gestational diabetes. Information in regard to reliability of the oral glucose tolerance test is important, as some conditions (common cold), or food (caffeine), or lifestyle habits (smoking) may alter the results of the oral glucose tolerance test.

^ Piwernetz K, Home PD, Snorgaard O, Antsiferov M, Staehr-Johansen K, Krans M (May 1993). "Monitoring the targets of the St Vincent Declaration and the implementation of quality management in diabetes care: the DIABCARE initiative. The DIABCARE Monitoring Group of the St Vincent Declaration Steering Committee". Diabetic Medicine. 10 (4): 371–77. doi:10.1111/j.1464-5491.1993.tb00083.x. PMID 8508624.
Emerging data suggest an important correlation between metabolic syndrome and risk of stroke. [58] Each of the components of metabolic syndrome has been associated with elevated stroke risk, and evidence demonstrates a relationship between the collective metabolic syndrome and risk of ischemic stroke. [59] Metabolic syndrome may also be linked to neuropathy beyond hyperglycemic mechanisms through inflammatory mediators. [60]