Linked is a great Linguist list post from 1995 by Laura Koenig that presents just about every way imaginable for getting learners to notice and remember lexical stress (and related vowel lengthening), including several hand clapping variants and using rubber bands. Most are visual/cognitive with no overt use of movement or touch. Judy Gilbert's workshops all come with free kazoo and rubber band. Just in terms of haptic anchoring, stretching a rubber band to anchor vowel length seems to work pretty well.
|Clip art: Clker|
I do, however, highly recommend the use of chest expanders for general conditioning and developing good upper body strength, breathing and flexibility--and working off stress.