First bad day.

In January I got sidelined by a cold for 3 weeks. I finished Week 3 Day 3 last Sat. This Sat I tried Week 4 Day 1 and it killed me. I realize I need to go out more than once a week. Should I repeat W3D3 or keep trying W4D1?

Today Sunday I'm beat. Any suggestions?

p.s. I also moved furniture Saturday ;-)