The physical therapy world calls this bird dog. The Pilates world calls it spinal balance. Either way, it is a great core (abdominals AND back) strengthener and stabilizer! Move with awareness and intention.
Related workouts
3 Minute Single Leg Ab Series
Squat Row
Diamond Glute Lifts
Core: Face Up. Face Down.
2:30 Plank Series! Yes!
Start Clean, End Dirty 20 min Upper
Straight Arm & Forearm Plank
One Side Then The Other! Lower Body!
Quad & Inner Thigh 5 Minute Floor Series