Dynamic self resistance is an interesting concept that allows you to work out in the comfort of your home (or hotel room) without any need for equipment.
The idea is essentially the same as training normally by pushing against resistance either statically or through a movement.
The only difference here though, is that rather than using a weight as the resistance, you use your own body to push against you.
For example then, to do a bicep curl you wouldn't hold a dumbbell as normal, but would instead use your free arm to push down against your own wrist as you went through the motion.
Other than the fact that this requires no equipment to perform and can be done anywhere, this also has several other advantages over normal resistance training.
One of these is that the resistance is the same through the whole range of movement rather than having 'sticking' points that are more difficult or more easy.
This means that the biceps will be developed more evenly in theory.
At the same time it's possible to vary the amount of resistance instantly to react to your ability, and as the set becomes harder you can lessen the pressure to create a 'drop set' style effect.
As well as working the biceps you can also work most other body parts with dynamic self resistance.
For example, by pushing downwards on your hand you can train the triceps, or by pushing your hands against each other in front of your chest you can train your pecs (this would be a form of static contraction as your arms wouldn't move and so would require you to do several reps to failure).