Jack Groppel

Active Coach

Video Library (32 videos)

Name FPS Duration
Correcting Common Stroke Errors (11 of 19) Dr. Jack Groppel’s animation of a tennis stroke error is presented from a neutral instructional perspective, filmed from a simplified side-view angle. The wrist is depicted breaking early with excessive flexion instead of maintaining stable extension through contact, emphasizing how poor grip support leads to a “bailing out” motion.
4s
Developing an Attacking Volley (10 of 12) Dr. Jack Groppel’s drop volley from the net, filmed from a side court-level angle. The racket face is slightly open at contact with the ball taken just in front of the body and the racket head moving minimally forward to soften the shot.
6.9s
Correcting Common Stroke Errors (12 of 19) Dr. Jack Groppel's forehand down the line from the center of the court, filmed from a side angle. His follow-through finishes high across his body while his weight drives forward into the court, bringing him quickly back toward a neutral ready position.
11.9s
Developing an Attacking Volley (11 of 12) Dr. Jack Groppel’s attacking half‑volley from the forecourt, filmed from a side CourtLevel angle. His continental grip is firm with a slightly laid‑back wrist, then the wrist stays relatively stable through contact with only a subtle forward snap to keep the racquet face controlled.
8.2s
Developing an Attacking Volley (12 of 12) Dr. Jack Groppel's attacking volley medley from the net position, filmed from a side court-level angle. The side view makes the early shoulder turn and coordinated trunk rotation into contact clear, with the upper body uncoiling forward in sequence before the arm extends through the volley.
7.2s
Correcting Common Stroke Errors (15 of 19) Dr. Jack Groppel’s forehand volley from the center of the court, filmed from a side court-level angle. The grip appears too hand-dominant with noticeable wrist flexion through contact, indicating excessive wrist involvement instead of a stable, firm continental grip.
3.5s
Correcting Common Stroke Errors (16 of 19) Dr. Jack Groppel’s biomechanics instruction on tennis stroke mechanics, filmed from a front instructional angle. The player’s split-step and transition into a neutral stance are broken down, with emphasis on how the feet set and weight transfers before initiating the swing.
14.6s
Correcting Common Stroke Errors (17 of 19) Dr. Jack Groppel’s forehand from a central baseline position, filmed from a side CourtLevel angle. The side view makes the limited wrist lag evident, with the racquet head not dropping fully behind the hand before forward acceleration.
7.1s
Correcting Common Stroke Errors (18 of 19) Dr. Jack Groppel’s animation of a tennis throwing motion is presented from a neutral, side-on biomechanical angle. The footwork detail includes a clear step-through with the front foot planting toward the target while the back foot pivots to support hip and trunk rotation.
4.2s
Correcting Common Stroke Errors (19 of 19) Dr. Jack Groppel's forehand throwing-motion drill from the center of the court, filmed from a side angle. His follow-through finishes high with the throwing arm extended forward while his weight transfers onto the front leg, quickly bringing the non-throwing hand back toward a ready position.
5.2s
August 2006 Issue Player's attacking volley from a neutral net position, filmed from a side angle. The hips stay slightly open toward the net while the knees stay flexed to let the player step through the volley with a forward-driving front leg.
8.9s
August 2006 Issue Dr. Jack Groppel's attacking volley from the net position, filmed from a side court-level angle. After contact he drives his weight forward into the court, with the racquet finishing in front as his non-hitting hand helps him quickly reset into a ready position.
8.9s
Correcting Common Stroke Errors (2 of 19) Martina's forehand return from the center position, filmed from a side angle. Her early split-step into a semi-open stance is followed by a short pivot and controlled weight transfer into the front foot during contact.
3.3s
Correcting Common Stroke Errors (1 of 19) Dr. Jack Groppel's biomechanics instruction on correcting common stroke errors, filmed from a court-level instructional angle. Hip rotation timing is clearly visible as he emphasizes loading into a flexed front knee and driving up from the legs to correct faulty lower-body mechanics.
11.5s
Correcting Common Stroke Errors (3 of 19) Dr. Jack Groppel’s biomechanics animation of a groundstroke, filmed from a side CourtLevel angle. The racket moves on a low-to-high swing path with the strings nearly perpendicular to the court at contact, striking the ball slightly in front of the lead hip.
6.1s
Developing an Attacking Volley (2 of 12) Dr. Jack Groppel’s split-step movement pattern at the baseline, filmed from a side animation view. The animation clearly depicts the timing of the hop landing just before the opponent’s contact, with both feet spreading slightly wider than shoulder-width into a balanced, ready stance.
8.8s
Correcting Common Stroke Errors (4 of 19) Dr. Jack Groppel's neutral-stance groundstroke from the center of the baseline, filmed from a side CourtLevel angle. His follow-through finishes high with the racquet wrapping across his body while his weight transfers fully onto the front foot before he recovers toward a ready position.
7.2s
Developing an Attacking Volley (3 of 12) Dr. Jack Groppel’s attacking volley biomechanics animation from a neutral net position, filmed from a side court-level angle. The racket is shown meeting the ball slightly in front of the lead hip with a firm, slightly open face and a compact forward punching swing path.
20.1s
Developing an Attacking Volley (4 of 12) Dr. Jack Groppel's forehand volley from the net position, filmed from a court-level side angle. His instruction emphasizes an early unit turn with the outside foot planting first, setting up a stable neutral stance before driving through the volley and then taking a small recovery step toward the ready position.
10s
Correcting Common Stroke Errors (5 of 19) Dr. Jack Groppel’s forehand biomechanics animation from a neutral front view, filmed from a court-level angle. The hips stay relatively quiet while the legs load with a clear knee bend, emphasizing how lower-body drive should precede upper-body rotation even without visible shoulder movement.
4.9s
Developing an Attacking Volley (5 of 12) Dr. Jack Groppel's forehand volley from the net area, filmed from a side court-level angle. After contact, his racquet continues slightly forward and upward while his weight moves into the court, with his non-hitting hand helping him stabilize into a compact ready position for the next shot.
9.2s
Correcting Common Stroke Errors (6 of 19) Dr. Jack Groppel’s instructional biomechanics animation on stroke mechanics, filmed from a neutral instructional angle. The animation emphasizes hip rotation leading the motion and coordinated leg drive, with a clear sequence from knee flexion in the loading phase to extension through impact.
9.5s
Developing an Attacking Volley (6 of 12) Dr. Jack Groppel's backhand volley from the net position, filmed from a side court-level angle. After contact he continues his momentum slightly forward with his weight moving into the court, and his non-hitting hand stays back to help his shoulders and torso square up quickly for the next shot.
10.9s
Correcting Common Stroke Errors (7 of 19) Federer's forehand from a neutral position, filmed from a side CourtLevel angle. His shoulders rotate well past 90 degrees relative to his hips on the unit turn, then the trunk uncoils ahead of the arm swing, creating clear separation between upper and lower body during the forward phase.
5.2s
Developing an Attacking Volley (7 of 12) Dr. Jack Groppel's backhand volley forward swing from the net position, filmed from a side court-level angle. The video emphasizes a firm continental grip with minimal wrist deviation, keeping the wrist stable through contact to drive the volley forward.
9.2s
Correcting Common Stroke Errors (8 of 19) Caroline's forehand arm-swing sequence from center court, filmed from a side animation angle. The animation clearly illustrates the shoulders rotating as a unit with the trunk on the unit turn, then the trunk uncoiling first while the hitting shoulder and arm lag slightly behind before accelerating through contact.
5s
Developing an Attacking Volley (8 of 12) Dr. Jack Groppel’s attacking drive volley from the net area, filmed from a side CourtLevel angle. His hips stay slightly closed as he steps forward, with a pronounced knee bend and strong leg drive through the front foot as he moves into the volley.
4.2s
Correcting Common Stroke Errors (9 of 19) Dr. Jack Groppel’s animation of pulling out of the shot from a neutral stance baseline position, filmed from a side biomechanical view. The racket face is shown opening early with contact occurring too far behind the ideal contact point, illustrating how the swing path pulls away from the ball through impact.
3.7s
Correcting Common Stroke Errors (10 of 19) Dr. Jack Groppel’s forehand biomechanics explanation from center court, filmed from a front angle. The shoulder and trunk rotation are emphasized as he illustrates a full unit turn with the torso coiling early and then uncoiling in sequence before the arm accelerates.
3.3s
Developing an Attacking Volley (9 of 12) Dr. Jack Groppel’s low attacking volley from the net area, filmed from a court-level side angle. From this view you can see a firm continental grip with minimal wrist hinge through contact, keeping the racquet face stable and slightly open to control the low ball.
6s
Correcting Common Stroke Errors (13 of 19) Caroline's two-handed backhand from a neutral court position, filmed from a side angle. Her hips stay relatively closed at racquet drop with a noticeable knee bend, then extend upward through contact as her back leg drives forward.
4.1s
Correcting Common Stroke Errors (14 of 19) Dr. Jack Groppel's left-handed forehand from a central baseline position, filmed from a side CourtLevel angle. The racket face is slightly closed at a contact point just in front of the lead hip, with the racket head accelerating upward on a steep low-to-high path.
4s

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