Tight hips can stem from multiple things, so I recommend you see a physical therapist, physiotherapist, or personal trainer to help identify the actual issue. Like I mentioned before, your hip flexors may be tight because they are shortened and weakened from desk jockeying all day, or maybe your workout is leading to a muscular imbalance. Perhaps your back is weak and some muscles are pulling double duty, creating extra tension. There’s also a good chance your core is weak and your glutes are underdeveloped.
The good news is that there are plenty of good hip stretches out there that you can do to relieve discomfort, decrease tightness, and increase mobility in your hips. Since your hips are involved in so many of the movements you make (both inside and outside of the gym) stretching them is a great way to keep them feeling good and ready to work for you. Add some of the 12 hip stretches Atkins demos below to the end of your workout, or spend 10 minutes each day just doing a few of them, to improve mobility in your hips.