I think the answer to your question would make this thread better, lol. I don’t know the names of these things but here is a picture of them, haha.
https://www.onlinesports.com/images/cp-wght284_x.gif I do that in the gym after running.
https://images.teamsugar.com/files/users/1/12981/32_2007/dip-machine.jpg I do variations of leg raises in this contraption.
Plyos must help the hip flexors too. I’m sure most gyms have these machines.