Nadya Suleman is getting candid about her health since giving birth to her octuplets in 2009. On Tuesday, the 47-year-old mom opened up about her fitness journey on Instagram since welcoming her eight children: Noah, Josiah, Nariyah, Maliyah, Jonah, Jeremiah, Isaiah and Makai, 14. Sharing several gym selfies and a video of herself in action, Suleman wrote in her caption, …