Blasted hot day arrrrr... haven't found me matey!
Heavy Jumpers usually refer to large-sized Jumping Spiders which are often very hairy. They can be very fast when provoked, but most of the time they are very trustful, and don't mind doing their own things while you photograph them~
Which reminds me... I still haven't seen the common Hyllus diardi yet T______T [Updated, found one! Here: www.flickr.com/photos/59583171@N07/16942485192]