Once you're in your Impact sports bra, make sure you've adjusted yourself to check its a good fit.
Scoop your boobs into the cups and have the straps done up tight enough! See what 'good' looks like below.
cups
✔️ Boobs comfortably inside the sports bra
✖️ Boobs spilling out the side / showing lots of cleavage (means cup size is too small)
✖️ Gaping fabric (means cup size is too big)
underband
✔️ Fits firmly on the loosest hook
✔️ Level all the way around
✖️ Riding up your back
straps
✔️ As a measure, the hook should be level with or above your armpit.
✔️ Fits firmly
✖️ Digging in (then loosen)️ / too loose (then tighten)