Before starting any rigorous exercise you should do a warmup for about 10 min which will help to stretch the major muscles. A good warm up will prepare you for the specific exercises that follow. Here, as you want to do exercises which help to jump higher, so warming up the legs is most important.
After doing a warmup you should feel flexible with heart pumping faster and the temperature of your body should increase.
There are two types of warmups, one is static and the other is dynamic. In static, as the name suggests, you will do exercises standing on one place whereas in dynamic warmup, simple movements are done to prepare for the real exercise.
Which is better - Static or Dynamic?
"A study [7] compared the effect of dynamic warm up (DWU) with static-stretching warm up (SWU) on power and agility. Subjects aged 18-24 years performed one of the two warm up routines (DWU or SWU) or performed no warm up (NWU) on 3 consecutive days with the process lasting 10-minutes in each case.
After 1-2 minutes of recovery, subjects performed 3 tests of power or agility i.e. T-shuttle run, underhand medicine ball throw for distance and a 5-step jump. Repeated measures revealed better performance scores after the DWU for the three performance tests relative to SWU and NWU. There were no significant differences between the SWU and NWU for the medicine ball throw and the T-shuttle run, but the SWU was associated with better scores on the 5-step jump. The authors concluded that because the results of this study indicate a relative performance enhancement with the DWU, the utility of warm up routines that use static stretching as a stand-alone activity should be reassessed.
It would be interesting to see this experiment repeated following a general warm-up process in all cases since this may be more analogous to many sports situations."