Sven Ibens, of Hayabusa fame, describes a set of principles which apply to any block move. Putting these into practice will improve your technique, your efficiency and your block times.
In the IPC 4-way dive pool, there are 22 different blocks. A lot of people think that each block requires a specific technique and a different approach. Of course, the formations look different and the grips that we take vary from block to block. However, the techniques used to turn the blocks are generally the same and the same principles apply.
Only one person should be flying at a time. All blocks can be split up in different stages. Generally a block consists of two or three different parts. During each part, only one member of a subgroup will fly and execute a move. His (or her) piece partner will remain in place, making it easier to control the block move. It is easier for a subgroup if one person flies at a time, rather than trying to fly together. Again, it is very important that you understand where your piece partner needs to go during the move so that you can guide him/her.
The goal is to fly as much as possible in straight lines and to avoid turning around each other within a subgroup. This is most efficient. Flying in straight lines will allow you to limit the distances between the centre points of the subgroups. It will also help you to open the door for your piece partner and create a space that he/she can use to execute his/her move.
Most people try to do too much, wasting energy and time. The aim is to do as little as possible. Economic flying is key. When briefing a skydive, look at your engineering from a distance and try to limit your moves. Stopping your moves is probably what we hear most when asking an experienced skydiver or coach for advice. Not stopping is possibly the most common mistake in skydiving. Including stops in your block move will allow you to stage the block and to keep everything over seeable for all team members.