There was an excellent example of the use of imagery on
Dancing with the Stars last night. Derek (the professional dancer) was having trouble getting his partner, Brooke (the gorgeous model star and mother of 4 kids), to stand up tall with her shoulders down and her chest slightly swayed away from him. It's the proper posture for the dance, but she naturally, like many of us, rolls her shoulders forward and lets her spine curve outward. Derek had her carry one of her babies in a front mount sling (what are those called? I'm not a mom yet, so not up on the lingo) in order to get a feel for the correct posture. Brooke has lots of experience carrying her children this way, and she immediately achieved the right position. Then - and here is the imagery part - she says she imagines carrying her baby while dancing in order to get it right without actually carrying him.
An important component to this example is that she used an aide that was applicable to her (it made sense) and she paid close attention to how her body felt doing it right. This made it easier to translate that to her imagining.
If you are attempting imagery for the first time, start with simple aides as Brooke did. Many coaches use props in sports for drills. These props can be imagined after they are removed. You may also imagine aides that could never really exist. One of my favorites as a swimmer is to imagine a fishing line from the top of my head to the wall and it reeling me in faster and faster. This makes sense to me. I bet it doesn't make sense to a lot of you. No, I am not a fishergal, but it's immediately and naturally applicable nonetheless. What works for you?
If you are attempting imagery for the first time in your sport, spend some time finding out how it feels to play first. Use all your senses. What does the environment look like? What does it smell like? taste like? What do you hear? What does your foot in the shoes or on the blocks, your hand on the racket, your head in the helmet feel like? What does the contraction and extension of your arm feel like? This last question taps into the kinesthetic sense, a tough one to describe, but it's the general physical feeling, torque, twist, movement of your body through the actions you are imagining. Once you are more aware of all this while you are active, you will be able to more easily incorporate this into your imagery.
Brooke was able to actually use an aide and do the skill right with it before using imagery. This is the easiest way proceed as a beginner. But you may imagine an aide you cannot actually use, such as fishing line from your head (that'd hurt if it were real!). And you may imagine doing skills right you have never done right before. Getting it right in your head can help you more quickly do it right physically.
Kudos to Derek as a creative teacher and to Brooke for excellent use of imagery!