Apps like FatMaxxer

Here are some great alternatives to FatMaxxer by Zed Industries :
CardioMez - Heart Rate Workout
CardioMez - Heart Rate Workout
★4.1
GPS Running Cycling & Fitness
GPS Running Cycling & Fitness
★4.8
Pulse Range Monitor & Alert
Pulse Range Monitor & Alert
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Polar Beat
Polar Beat
★3.9
Polar Flow
Polar Flow
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Fitness Calculator
Fitness Calculator
★3.6
Heart Rate Monitor
Heart Rate Monitor
★4.6
Uptivo
Uptivo
★4.5
HIIT & Cardio Workout
HIIT & Cardio Workout
★4.7
Trainer Run, walk & bike
Trainer Run, walk & bike
★4.3
HIIT • Workouts & Timer
HIIT • Workouts & Timer
★4.7
Zone 2 Running Metronome Timer
Zone 2 Running Metronome Timer
★4.8
Frontier X
Frontier X
★4.4
HR2VP Cycling & Bike Training
HR2VP Cycling & Bike Training
★3.3
Tabata HIIT. Interval Timer
Tabata HIIT. Interval Timer
★4.8
HIIT - interval workout PRO
HIIT - interval workout PRO
★4.6