Building Combinations
Once you are comfortable with all of the combatives you have learned thus far you should begin practicing your efficiency at delivering them in combinations of well-controlled flurries. Combinations should not be wild. They are clean, controlled sequences of various striking techniques that are delivered in a rapid and overlapping succession to one or more targets on your opponent(s). This requires much more work out of you than you have experienced while practicing multiple solo combatives. In the long run, however, it makes for a much better offense than simply practicing one combative at a time.
Training to deliver effective strike combinations will require you to develop good balance, cultivate your skill at shifting your weight properly, and will test your ability to maintain a good Fighting Stance while your entire body is in motion (both the upper and lower half).
When putting combinations together, as one strike comes back the other strike begins to develop. The momentum of one attack can help increase the power of the next attack. In a Krav Maga conditioning program there are four basic fighting combinations that are commonly practiced and trained on a heavy bag. The number indicates how many alternating punches are going to be delivered, leading with a Jab and ending with the opposite leg Round Kick to finish the combination.
For instance, Basic #3 would be three punches, left-right-left, followed up with the opposite leg kick. Since the last punch was a left punch, you would finish with a right leg Round Kick.
These combinations can only be practiced with a heavy bag because of how the weight and force is transferred while performing the combinations. The basic four fighting combinations are as follows:
Basic #1 = left punch, right round kick
Basic #2 = left-right punch, left round kick
Basic #3 = left-right-left punch, right round kick
Basic #4 = left-right-left-right punch, left round kick
Once you have mastered these combinations with Straight Punches (Chapter 13, page 149), every time you have a third punch (as in combinations 3 and 4) you can change that punch to a Hook Punch.
Delivering a Round Kick from the forward leg is a more advanced kick because you need to understand how to keep enough distance between you and the bag in order to have enough space to develop the kick. It's also a weaker kick so it does not feel as satisfying as kicking with the back leg. Knowing this you should understand that basic fighting combos 2 and 4 will feel more challenging to make strong and solid to the bag since they both end with a forward leg Round Kick. Practice combinations 1 and 3 until you feel like you have mastered those before moving on to combinations 2 and 4.

