Damn, groin, glute and ham is quite a big area for a spasm. With spasms you can try to do light static stretching (don't go heavy on it, you might end up pulling something because when the muscle is in spasm it has almost zero give), some light ART or just trigger point therapy (just apply pressure to the tight/painful point for a minute or so, again go light with it and don't expect immediate significant results), and light continuous contractions in the non-painful ROM. Allow a few days for it to ease out and don't push it in training (worst case you will end up with a muscle tear, best case it will tighten up again and prolong rehab time). Or maybe it is just bad DOMs and you are a pussy (what are the symptoms?).