For your edification and reading pleasure:
Strength Training Through My Pregnancy
by Angie Bryant, SSC (from Starting Strength)
"Prowler Base+1" (sled)
1. Load up a manageable weight.
2. Sprint 40m at 85% intensity.
3. Rest 30 sec.
4. Repeat 5-15 times.
Courtesy of "Death by Prowler" by Matt Reynolds and Stef Bradford (on Starting Strength).
Couch stretch for 2:00/leg