Northern Star wrote:
The scientific evidence supports doing hip muscle strength - especially hip abductor and external rotator strength - to prevent injuries, but not abdominal strength. It's far better to spend your time doing hip strength than situps or crunches.
Example:
http://www.ncbi.nlm.nih.gov/pubmed/15654186Doing strength work for performance is another story.
If you had actually understood what's in the articles you refer to, you could also have told us other equally "logic" conclusions of this bogus experiment, namely that strong hip adductors lead to injuries.
So don't train weights. You risk getting strong adductors and get injured. Science says so.