Running Program

Am not trying to lose any more weight but trying to stick to a running program. Have reduced my running program to 6x400m now, due to some problem with my knees. I also run on the spot faster for a count of 100 to 400 as part of the 2 minute sessions during the day. Still run around 2 miles - one mile of which will be at a faster pace on alternate days. Seems okay today so far.