Baseline measure (from a leg at random)

PHASE 1: Leg 1 - exercises, Leg 2 does nothing

- Measurement again of BOTH legs at 6wk

PHASE 2: Legs 1 AND 2 BOTH do a different exercise (for 6wk)

- Measurement again of BOTH legs at 12wk (6wk for phase 1 + 6wk for phase 2)

I can easily run this as a 1-way RM ANOVA and determine differences between means. BUT, my advisor says this is a 2-way RM ANOVA, but if that's so then how do I account for the single baseline measure that is really the 'common baseline' for BOTH legs? IF I had made the measurement at baseline in both legs, then I get it... it's a complete 2-way design with time and leg as factors. However, I only made a single baseline measure... can't go back and redo this and I am stumped!

ANY help would be appreciated!