Recently, I have been enjoying Chris Ritter's Sports Performance podcast. He has been interviewing an impressive list of coaches, and a recent one he spoke with new Pittsburgh (former U Penn) assistant Coach Marc Christian, and in it Christian spoke about a kick set his mentor Jim Steen used to do at Kenyon.
Coach Christian used this set once every 8-10 days with his sprinters at Penn.
10 x 100 kick @ :10 rest, aiming for the fastest possible overall time. Record total times and seek gradual improvement every time the set is performed.