Classic old-time 20 min Silent Meditation: 
  
1 - Sit alone quietly, eyes closed, wait a moment . . . then 
  
2 - Silently repeat a short mantra(mono-syllabic is Okay) or prayer-mantra. 
  
3 - Repeat step #2 for 20 minutes*. 
  
4 - At finish, direct attention to any points of discomfort in the body. End. 
  
  
*During step #2-3, the mind will wander away from the task of the mantra repeatition. When that happens, simple return to repeating the mantra.