Love small training tips, it's all about the small tricks:
For person's with shoulder issues, who love dips:
-Using fat grips, 3" D BB, or large foam pads help increase the surface area of the dip bar and eases tension off the shoulders, allowing people with mild-moderate shoulder injuries to do dips. *Also works with BB Bench Press, BB Incline Bench, and Close-Grip Bench.
Overhead pressing problems:
-Shifting the angle of overhead pressing motions to slightly neutral or half-way inbetween is sometimes enough of a shift to enable overhead work to be done by people with impingement syndrome problems. Varying angles of lifts can sometimes help accomplish the same goal and enable you to complete exercises that normally cause pain.
For knee pain w/o complete tears in meniscus or lig/tend:
-Sled dragging (forward/backward); prowler pushing; lunges while resistance is pulling backward from a harness eases pressure off the knee joints, while still giving the legs a great workout. Tire flips work great as well, only more for the posterior chain.
-Warming up with KB swings helps increase deadlift power tremendously.
-Jump squats improve overall squat performance.
-Ramping is the best thing next to marinated tri tip.
Just thought I'd throw in a few. I'm sure there are more, but that would require more thought than I am willing to put forth today.