I heard that Bill Pearl wrote a wonderful book containing thousands of exercises for dumbell & barbell, titled "Keys to the Universe." You may want to check it out.
In the meantime here are some great lat exercises (I feel that it's always best to try new exercises with a fairly-light weight & using fairly-slow movement to get the feel of the exercise without undue risk of injury or overdoing it -- then adjust from that point):
* Bent-Over Supported 1-Arm Row
-- with a DB in hand, lean forward at the waist/hips & place your free-hand on a bench or some other support... stretch your weighted-hand as far down as you can towards the floor, then raise your elbow upward as high as you can (stretch on the down)
---> variations include palms-inboard (most-common), thumbs-outboard (common), thumbs-inboard, rowing to one's waist/hip/lower-rib-area (common), rowing to lower-pec (common), rowing to shoulder... don't force any position (do what feels comfortable) -- then switch hands & do other side
* Bent-Over Supported 2-Arm Row (w/ & w/o Head-Support)
-- similar to above, but without a free-hand & involving less of a downward stretch as well as less of an upward pull (nevertheless, focus on the lats stretching on the down); keep butt well back (can also sit on the end of a bench, or stradling one), especially if not using a head-support
* SHRUG-ROLLBACK-to-LAT-LOCKOUT-to-LAT-STRETCH-STIFF-LEG-DEADLIFT
-- (as you guessed this great lat exercise has many parts) with 2 DBs in hand, shrug up-&-out-then-back-&-down & lock your lats in a spread-out position, then SLOWLY lower hands as if to touch your toes (making the lats stretch); stiff-leg dead-lift upward (you've just completed 1-rep)
* Towel Lat-Stretch(es)
-- tie a towel to some support at about pec level (can use rope to help tie-off); with both hands grabbing towel (one hand forward of the other) pull towel directly towards front of abs (stretching lats -- then switch hands)
---> variations include pulling to side of hip, or merely grabbing any large towel at both ends with towel across lap-area & pulling outward (stiff-arm-style... can also do with towel behind at butt-level for a slightly different stretch)
* Pole/Door-Jamb Lat-Stretch
-- hold onto a sturdy vertical pole or door-jamb with one hand, & while bending at the knees lean back (almost like you're beginning to sit)... stretch the one lat, then switch hands & do the other as well
* HANDS-on-HEAD ELBOWS-FORWARD-UP LAT-SPREAD
-- place hands on head as if a prisoner/POW... now while keeping hands touching head, bring elbows forward & upward (shoulders will go forward as well & lats will feel the work)
* 1-HAND-on-HEAD ELBOW-FORWARD-DOWN LAT-CONTROLLER(S)
-- similar to above, but with one hand & going forward & downward with the elbow while keeping head errect (a bit more difficult to get the feel in the lats, but work on it often & you'll get the full benefit)
---> variations: 2-handed (easy version), or hand behind head (which not only stretches the one lat, but you'll feel it pull across to the opposite shoulder as well)
* TIGER (Chinese 5-Animal Play: a Breathing Exercise)
-- Stand with right-foot pointing slightly outward (duck-style) & place the left-heel directly in front of the right-heel with right-side's toes pointing straight forward; hands are fisted; left-arm is held straight & raised up & forward about 45-degrees above shoulder level while right-arm is bent with elbow back, hand at (or just above) right-hip; bend head forward at neck & place left-ear against left-upper-arm-area; now, while breathing deeply stretch left-fist outward & upward as much as possible as if trying to touch a star with your fist's knuckles (this will stretch & work the lats, especially the lower lats)
The above instructions are approximate starting points... again: start light & slow to get a feel for each exercise that you try: experiment safely & then adjust from there (first get it so YOU feel it working the lats comfortably, which may mean varying a bit from my instructions -- then add weight & speed as you deem appropriate)
Have Fun
