Gym shorts should stay comfortable at the waist and leave you enough room for the movements you actually do. The fit name alone will not tell you how the hem, thigh and waistband will feel. Use the product photos and size chart, then try a few simple movements if you can.
Start with the waistband
Look for a waist that stays in place when you walk, bend and sit. If you keep pulling the shorts up, the waist may be too loose. If the band digs in when you sit or squat, try another size or cut. Compare your waist measurement with the chart on the exact product page; size labels can differ between styles.
Check the thigh and hem
The leg opening should give you the amount of room you prefer without bunching when you lift your knee. Some shoppers like a closer outline; others want more space around the thigh. Hem length also changes how the shorts look and feel. Check where the hem falls on the model, but remember that the same shorts can sit differently on another height or body shape.
There is no one inseam that works for every gym session. If you have a pair you already like, measure its waist and inseam and compare those numbers with the product chart where they are available. Photos help with shape; measurements help with size.
Compare two Athflex shorts
The Performance Shorts in Black are listed as regular fit, with an elastic waistband and 100% polyester mechanical stretch fabric. The Velocity Slit Shorts in Black are also listed as regular fit, with a side slit and zipped pockets. Those details give you two different starting points. Check each page's photos and size chart before choosing; “regular fit” does not supply a shared measurement.
Do a movement check
When trying shorts on, squat, step up and sit down. Notice whether the waistband shifts, the fabric catches at the thigh or the hem rises farther than you like. Carry a phone or keys during training? Check the pockets with those items too. Pocket style matters less than whether it works for what you carry.
Choose the pair you will wear
Start with the waist measurement, then decide how much leg room and hem coverage you prefer. Use the product photos to judge the cut and the size chart to choose a size. You can also browse the Athflex shorts collection for other colours and designs; check the current details on each product page.
Common questions
Should gym shorts be tight or loose?
Choose enough room for your usual movements and a waistband that stays comfortable. The right amount of room is a fit preference, so use the photos and measurements for the specific pair.
Can I use my usual trouser size?
Use it as a starting point, then check the shorts' own size chart. A familiar size label does not guarantee the same waist or thigh fit in a different garment.
What length of gym shorts should I buy?
Compare the listed length, if provided, with shorts you already wear. Look at where the hem falls in product photos and consider how much coverage you prefer when moving.