I have just purchased the front split stretch series. I am a national level swimmer and was hoping to eventually use all three stretch series to help with my mobility, without the foundation or other series, as there is no way I could fit it into my training program. The biggest draw card for me was that I thought they included weighted mobility drills. Increasing strength in range of motion. Aside from the calf raises the front split series does not include any jefferson curls or other exercises I expected it might. Do the other stretch series (thoracic bridge, middle splits) contain weighted mobility?