Do the following about 4 days per week:
1. Simulate Lydiard hill reps but on the flat in your house. Bring knees up slightly higher than normal running motion while landing and springing off forefoot. Start with 30-40 reps build to 5 sets of 300-400. Quick tempo but not all out.
2. Short forward hops on one leg landing on ball of the foot. Kinda like one leg rope skipping but you are not using the jump rope. Jump rope is not necessary. Not for height or disatne but quick,quick, quick! Start with 20-30 reps. Build to3-4 sets of 100.
3. Skipping for height. Self explanatory. Build to several sets of 100.
4. Stand near a wall and use hands for balance. Do 1/4 squats on one leg at a time and spring upwards explosively landing on ball of foot and spring up again. Simulates more closely the knee angle when running than half or deep squats. 10-30 reps.
5. Get about 2-3 feet away from your bed. Stretch out one leg fairly straight on to bed so you are standing on one leg. Spring up and down on that foot. Start with 20 reps build to 100.
6. 1/4 squats one leg near a wall using hands for balance with 25 to 50 lb. backpack on. Controlled descent and rise. Like #4 above but not a spring jump. Start with 10 build to 40-50 reps.
It will all be in my book with illustrations in a few months, "Indoor Training the Cro Magnon Way". Author Skip Hopper.