Many smart scales have an athlete mode usually aimed at people who do more than 10 hours of exercise a week and have a resting heart rate (RHR) that’s lower than 60. This setting tells the scale to give higher muscle and lower body fat readings. Scales I recommend that have athlete modes include: Withings Body Smart, Garmin Index S2, Wyze Scale X, Renpho Smart Body Fat Scale.
Many athletes want to use a scale that integrates their data into whatever app they use to track their activities. So, a Garmin user may find the Garmin Index S2 the best option, for example.