A quick 5-minute ab workout, with no repeats. Do this after a workout, or for those days you want to train your abs a little harder. Osteoporosis-friendly options are shown.

Tools: a chair or bench if you're a beginner

1 x 45sec
Plank
Slo mountain climber (alt: off a chair)
Dead bug
Figure 4 oblique crunch (osteo-friendly: side plank)
Figure 4 oblique crunch (osteo-friendly: side plank)