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
Start Clean, End Dirty 20 min Upper
Figure 4 Squats
Core: Face Up. Face Down.
Sumo Squats
Row, Flies & Sumo Squat Triplet
Plank with Knee to Nose/Elbow
Medicine Ball Toss with Courtney
Knee Drive Lunges
1 Minute Tricep Dip Series