У вашего броузера проблема в совместимости с HTML5
Modifications
Side to side grounded switches
Vertical Butt Kicks
Snow Boards
Split Jumps
Pop Squats
Slam Its
Football Runs
Dixie Cup Shuffles
Forward leaning lunges
Surfer Thrusts
Pivoting Apple Pickers
Corner to corner diagonal lunges
Cross under kicks
Power scissors
1 Arm Burpees
Jump front/back Plie Jack/ 2 boxes
Lateral Leg Thrust Burpees
Half Circle Shuffle Sprints
2 forward hops (hop, turn, air jack)
Wide Burpees
High Reaching pop Squats
4 Hover Hops/2 plyo jacks
Straddle jump freeze
Over & over jump
Jump up & down/power 7
3 wide box jumps/1 plyo jack
Fast Feet Shuffle
Forward back Shuffle Hops