heavy legs

Mon.- 9 miles home from work, 1:05:07. Legs feel aweful, very tired and muscle soreness.
Tues. Mountain biked 10 miles, 45 minutes, legs still feel heavy. no soreness
Wed.-2 mile warm up. workout, 200, 200, 800 x 4. I only managed three sets. I was drastically falling off the pace starting the last set so I called it quits. times- 35, 35, 2:43, 36, 35, 2:46, 34, 35, 2:53, 37.
Thur.- 4 miles easy
Fri.- 0
Sat.- 0
Sun.- 12 with Angella, very easy pace
total;- 29