What it is
A floor core drill where opposite arm and leg move while the trunk stays quiet.

Exercise Library
Track dead bugs by reps per side, range, and trunk-control notes.
Use these cues for app form guide popups and workout-log reminders.
These definitions match the app form-guide popup language.
Lightly tighten the midsection as if preparing for a cough while still breathing.
A comfortable spine position that keeps the natural curves without forcing a hard arch or tuck.
Repetitions performed with steady speed, body control, and no bouncing.