The Wide Leg Split pose (aka Upavishta Konasana or Straddle Split) is generally recognised as an "advanced pose" because it requires deep flexibility and strength.
Here are some preparation poses you can practise helping you go further into the Wide Leg Split...
https://georgewatts.org/lesson-planner/yoga_pilates_poses/straddle-leg-bent/
https://georgewatts.org/lesson-planner/yoga_pilates_poses/straddle-legs-bent/
https://georgewatts.org/lesson-planner/yoga_pilates_poses/straddle-upright/
https://georgewatts.org/lesson-planner/yoga_pilates_poses/cow-arm-leg-raises/
https://georgewatts.org/lesson-planner/yoga_pilates_poses/downward-facing-dog-split/
https://georgewatts.org/lesson-planner/yoga_pilates_poses/frog-2/
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And when you're ready, here are some advanced Split poses...
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https://georgewatts.org/lesson-planner/yoga_pilates_poses/straddle/
https://georgewatts.org/lesson-planner/yoga_pilates_poses/straddle-toe-grasp/
https://georgewatts.org/lesson-planner/yoga_pilates_poses/straddle-side-bend-twist-iii/
https://georgewatts.org/lesson-planner/yoga_pilates_poses/monkey/
https://georgewatts.org/lesson-planner/yoga_pilates_poses/standing-split/
https://georgewatts.org/lesson-planner/yoga_pilates_poses/wide-leg-split-cheek/
https://georgewatts.org/lesson-planner/yoga_pilates_poses/archer/
https://georgewatts.org/lesson-planner/yoga_pilates_poses/both-big-toe/
